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1SXPS Catalogue: On-line Documentation
------------------------------------------------------------------------
Summary / Quick-start information
Data included 2004 Dec 12 2012 October 12
Sky coverage 1905 square degrees
Typical Sensitivity
(0.3-10 keV) 3x 10^-13 erg cm^-2 s^-1 (single observation)
9x 10^-14 erg cm^-2 s^-1 (stacked images)
Typical error 5.5'' (90% confidence radius, including systematics)
Detections 585,443
Unique sources 151,524
Variable sources 28,906
Uncatalogued sources 82,282
False positive rate Flag=Good 0.3%
Flag=Good/Reasonable 1%
Flag=Good/Reasonable/Poor 10%
*Table 1.* Summary details of the 1SXPS catalogue.
The 1SXPS catalogue covers 1905 square degrees on the sky and contains
position, fluxes, spectral details and variability information for
151,524 X-ray point sources detected by the Swift X-ray Telescope
between 2004 Dec 12 and 2012 October 12. Each source has a detection
flag which indicates how likely it is to be a real astrophysical object.
Table 1 <#Table1> shows the false positive rate as a function of flag
and other summary information.
The catalogue, which is described in full in Evans et al (2014)
employs an iterative sliding-cell detection procedure, which
is significantly more sensitive than previous XRT catalogues. This
process is described in detail in the paper and summarised
here . Extensive verification has
also been carried out to ascertain the reliability and completeness of
the catalogue and the various products. We also cross correlated this
catalogue with a number of existing catalogues and databases.
------------------------------------------------------------------------
Data Access and Usage
The catalogue can be downloaded as a FITS file, CSV file or SQL dump
or queried through this page . Not all columns
contain values for each entry in the tables, for example, in the
/Sources/ table <#sourceTab>, only sources for which a spectral fit
exists have entries in the |Fitted*| fields. In the CSV files, such
empty entries are literally empty; in the FITS and SQL files these
entries are .
If you use data from this catalogue in your work, please cite Evans et
al. (2014) and in the acknowledgements section of your
publication, please state:
!!This work made use of data supplied by the UK Swift Science Data Centre
at the University of Leicester.!!
------------------------------------------------------------------------
Catalogue Contents
There are four tables available for download:
Sources <#sourceTab>
This is the main catalogue table, the only one which is available in
Vizier. This contains the details of the 151,524 unique sources in
the catalogue.
Detections <#detTab>
This contains details of the individual detections in each dataset
and energy band, of the sources.
Datasets <#fieldTab>
This contains details of the individual datasets (observations and
stacked images) of which the catalogue is composed.
Cross correlations <#xcorrTab>
This contains details of sources from external catalogues which are
positionally coincident with 1SXPS sources.
------------------------------------------------------------------------
Sources Table
The /Sources/ table is the main catalogue table, and gives details of
each unique source identified in the catalogue. There are 1/2 columns in
this table in total, so for ease of consideration we have grouped them
into the following categories:
* Identifiers <#sources_name> (1 column)
* Position information <#sources_pos> (7 columns)
* Exposure information <#sources_exp> (5 columns)
* Flag information <#sources_flag> (6 columns)
* Count-rate information <#sources_rate> (30 columns)
* Variability information <#sources_var> (8 columns)
* Spectral/Flux information <#sources_flux> (111 columns)
* Cross-correlation information <#sources_xcorr> (14 columns)
Identifiers
There is 1 column in this group. Show .
Name
The unique IAU format unique source name, of the form: |1SXPS
JHHMMSS.S+ddmmss|
------------------------------------------------------------------------
Position information
There are 7 columns in this group. Show .
Hide column list .
RA
The Right Ascension (J2000) of the source, taken from the individual
detection with the smallest error.
Decl
The declination (J2000) of the source, taken from the individual
detection with the smallest error.
Err90
The 90% confidence radial position error on the source position,
taken from the individual detection with the smallest error. This
includes the astrometric systematic error.
AstromType
This relates the provenance of the astrometry used to derive the
source position.
* *0*: Astrometry from the Swift star trackers.
* *1*: Astrometry from rectification with 2MASS.
l
The Galactic longitude in degrees of the best position of the source.
b
The Galactic latitude in degrees of the best position of the source.
OffAxis
The mean distance angle (in arc minutes) of the source from the
centre of the XRT detector averaged over all observations in which
the source was detected and inside the XRT field of view. There is a
handful of sources for which this value is -1. This indicates that
the source centre was never in the field of view, that is, the
detection and centroid was based on the wings of the PSF that
extended into the field of view.
------------------------------------------------------------------------
Exposure information
There are 5 columns in this group. Show .
Exposure
The total exposure at the location of the source in seconds,
including datasets in which the source was not detected.
StartDate
The UT date and time of the start of the first observation of the
source location (regardless of whether the source was detected).
StopDate
The UT date and time of the end of the last observation of the
source location (regardless of whether the source was detected).
NumObs
The total number of datasets (observations+stacked images) which
cover the location of the source, including those in which the
source was not detected.
NumDetObs
The number of datasets (observations+stacked images) in which the
source was detected.
------------------------------------------------------------------------
Flag information
There are 6 columns in this group. Show .
DetFlag
The best detection flag from all detections of the source. This is a
numerical value, normally 0 (=/Good/), 1 (=/Reasonable/) or 2
(=/Poor/) For sources which lie inside a region which was identified
in the manual screening stage as containing artefacts the flag
values are 8, 9 and 10 for the three categories. Those in a region
manually marked as containing diffuse emission have flag values of
16,17 and 18. In the case where the flag has a value >2 the /Good/,
/Reasonable/ or /Poor/ definitions indicate the strength of the
detection, however the source is highly likely nonetheless to be
spurious.
Fieldflag
The best field flag from all detections of the source. This can be
either /Good/ (=0) or /Flagged/ (=1 or 2). The latter indicates that
there are artefacts (flag=1) and/or extended emission (flag=2) in
the field which may affect the flux levels of the point sources
detected.
DetFlag_band0
The best total-band (0.3-10 keV) detection flag from all detections
of the source.
DetFlag_band1
The best soft-band (0.3 - 1 keV) detection flag from all detections of
the source.
DetFlag_band2
The best medium-band (1-2 keV) detection flag from all detections of
the source.
DetFlag_band3
The best hard-band (2-10 keV) detection flag from all detections of
the source.
------------------------------------------------------------------------
Count-rate information
There are 30 columns in this group. Show .
Rate_band0
The time-averaged total-band (0.3-10 keV) count-rate of the source,
in counts per second.
Rate_band0_pos
The 1-sigma positive error on the time-averaged total-band (0.3-10 keV)
count-rate of the source. If more than 30 events were detected in
this band (after background subtraction) this is the Poisson error,
otherwise it is calculated from the Bayesian method of Kraft,
Burrows & Nousek (1991)
.
Rate_band0_neg
The 1-sigma negative error on the time-averaged total-band (0.3—10 keV)
count-rate of the source. If more than 30 events were detected in
this band (after background subtraction) this is the Poisson error,
otherwise it is calculated from the Bayesian method of Kraft,
Burrows & Nousek (1991)
.
Rate_band1
The time-averaged soft-band (0.3—1 keV) count-rate of the source, in
counts per second.
Rate_band1_pos
The 1-sigma positive error on the time-averaged soft-band (0.3—1 keV)
count-rate of the source.
Rate_band1_neg
The 1-sigma negative error on the time-averaged soft-band (0.3—1 keV)
count-rate of the source.
Rate_band2
The time-averaged medium-band (1—2 keV) count-rate of the source, in
counts per second.
Rate_band2_pos
The 1-sigma positive error on the time-averaged medium-band (1—2 keV)
count-rate of the source.
Rate_band2_neg
The 1-sigma negative error on the time-averaged medium-band (1—2 keV)
count-rate of the source.
Rate_band3
The time-averaged hard-band (2—10 keV) count-rate of the source, in
counts per second.
Rate_band3_pos
The 1-s positive error on the time-averaged hard-band (2—10 keV)
count-rate of the source.
Rate_band3_neg
The 1-s negative error on the time-averaged hard-band (2—10 keV)
count-rate of the source.
Counts_band0
The total number of events (not background subtracted or exposure
corrected) in the total-band (0.3—10 keV) image, in the source
extraction region for this source. This is found by summing the
counts in the individual observations of the location, not from the
stacked image.
Counts_band1
The total number of events (not background subtracted or exposure
corrected) in the soft-band (0.3-1 keV) image, in the source
extraction region for this source.
Counts_band2
The total number of events (not background subtracted or exposure
corrected) in the medium-band (1—2 keV) image, in the source
extraction region for this source.
Counts_band3
The total number of events (not background subtracted or exposure
corrected) in the hard-band (2—10 keV) image, in the source
extraction region for this source.
BGCounts_band0
The sum of the background map in the in the total-band (0.3—10 keV)
source extraction region for this source. This is found by summing
the maps in the individual observations of the location, not from
the stacked image.
BGCounts_band1
The sum of the background map in the in the soft-band (0.3—1 keV)
image, in the source extraction region for this source.
BGCounts_band2
The sum of the background map in the in the medium-band (1—2 keV)
image, in the source extraction region for this source.
BGCounts_band3
The sum of the background map in the in the hard-band (2—10 keV)
image, in the source extraction region for this source.
CF_band0
The count-rate correction factor in the total band (0.3—10 keV). The
count-rate correction factor. This corrects for vignetting, bad
columns pile-up and the finite radius over which counts were extracted.
CF_band1
The count-rate correction factor in the soft band (0.3—1 keV). The
count-rate correction factor.
CF_band2
The count-rate correction factor in the medium band (1—2 keV). The
count-rate correction factor.
CF_band3
The count-rate correction factor in the hard band (2—10 keV). The
count-rate correction factor.
HR1
The HR1 hardness ratio = (M-S)/(M+S) where M and S are the medium
(1—2 keV) and soft (0.3—1 keV) band count-rates. If both bands had
more than 100 photons and an SNR of at least 2 this was calculted
simply from this equation, otherwise the Bayesian approach of Park
et al. (2006)
was employed.
HR1_pos
The 1-σ positive error on HR1. In a small number of cases where the
Bayesian approach of Park et al. (2006)
was used to
derive HR1, the mean HR value lay outside the 1-σ confidence
interval. In these cases the HR1_pos error may be negative.
HR1_neg
The 1-σ negative error on HR1. In a small number of cases where the
Bayesian approach of Park et al. (2006)
was used to
derive HR1, the mean HR value lay outside the 1-σ confidence
interval. In these cases the HR1_neg error may be positive.
HR2
The HR2 hardness ratio = (H-M)/(H+M) where H and M are the hard
(2—10 keV) and medium (1—2 keV) band count-rates. If both bands had
more than 100 photons and an SNR of at least 2 this was calculted
simply from this equation, otherwise the Bayesian approach of Park
et al. (2006)
was employed.
HR2_pos
The 1-σ positive error on HR2. In a small number of cases where the
Bayesian approach of Park et al. (2006)
was used to
derive HR2, the mean HR value lay outside the 1-σ confidence
interval. In these cases the HR2_pos error may be negative.
HR2_neg
The 1-σ negative error on HR2. In a small number of cases where the
Bayesian approach of Park et al. (2006)
was used to
derive HR2, the mean HR value lay outside the 1-σ confidence
interval. In these cases the HR2_neg error may be positive.
------------------------------------------------------------------------
Variability information
There are 8 columns in this group. Show .
PvarPchiSnapshot_band0
The probability that the source is constant within a single snapshot
in the total band (0.3—10 keV), as derived from the Pearson's χ^2
test. The minimum recordable value for this is 1.1×10^-16 so values
of 0 mean <1.1×10^-16 .
PvarPchiSnapshot_band1
The probability that the source is constant within a single snapshot
in the soft band (0.3—1 keV), as derived from the Pearson's χ^2 test.
PvarPchiSnapshot_band2
The probability that the source is constant within a single snapshot
in the medium band (1—2 keV), as derived from the Pearson's χ^2 test.
PvarPchiSnapshot_band3
The probability that the source is constant within a single snapshot
in the hard band (2—10 keV), as derived from the Pearson's χ^2 test.
PvarPchiObsID_band0
The probability that the source is constant between observations in
the total band (0.3—10 keV), as derived from the Pearson's χ^2 test.
PvarPchiObsID_band1
The probability that the source is constant between observations in
the soft band (0.3—1 keV), as derived from the Pearson's χ^2 test.
PvarPchiObsID_band2
The probability that the source is constant between observations in
the medium band (1—2 keV), as derived from the Pearson's χ^2 test.
PvarPchiObsID_band3
The probability that the source is constant between observations in
the hard band (2—10 keV), as derived from the Pearson's χ^2 test.
------------------------------------------------------------------------
Spectral/Flux information
There are 111 columns in this group. Show .
GalNH
The Galactic absorption column density (in cm^-2 ) in the direction
of the source, determined from Willingale et al. (2013)
.
whichPow
Which of the available estimates of the power-law spectral ECF and
fluxes is given in the summary fields:
* *0*: Fixed spectrum
* *1*: HR-interpolated
* *2*: Fitted spectrum
whichAPEC
Which of the available estimates of the APEC spectral ECF and fluxes
is given in the summary fields:
* *0*: Fixed spectrum
* *1*: HR-interpolated
* *2*: Fitted spectrum
PowECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming the power-law spectrum indicated by the
|whichPow| field.
PowECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming the power-law spectrum indicated by the
|whichPow| field.
PowFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming the
power-law spectrum indicated by the |whichPow| field.
PowFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the |band0Rate_pos| field multiplied by the |PowECFO| field, so
does not include uncertainties in the spectral modelling.
PowFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the |band0Rate_neg| field multiplied by the |PowECFO| field, so
does not include uncertainties in the spectral modelling.
PowPeakFlux
The maximum observed 0.3—10 keV flux (in erg cm^-2 s^-1 ) for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |PowECFO| field.
PowPeakFlux_pos
The 1-σ positive error on the maximum observed 0.3—10 keV flux for
the power-law spectrum indicated by the |whichPow| field. This is
taken from the bin in the total-band per-snapshot light curve with
the highest value, multiplied by the |PowECFO| field, so does not
include uncertainties in the spectral modelling.
PowPeakFlux_neg
The 1-σ negative error on the maximum observed 0.3—10 keV flux for
the power-law spectrum indicated by the |whichPow| field. This is
taken from the bin in the total-band per-snapshot light curve with
the highest value, multiplied by the |PowECFO| field, so does not
include uncertainties in the spectral modelling.
PowUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming the
power-law spectrum indicated by the |whichPow| field.
PowUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the |band0Rate_pos| field multiplied by the |PowECFU| field, so
does not include uncertainties in the spectral modelling.
PowUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the |band0Rate_neg| field multiplied by the |PowECFU| field, so
does not include uncertainties in the spectral modelling.
PowPeakUnabsFlux
The maximum unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ) for the
power-law spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |PowECFU| field.
PowPeakUnabsFlux_pos
The 1-σ positive error on the maximum unabsorbed 0.3—10 keV flux for
the power-law spectrum indicated by the |whichPow| field. This is
taken from the bin in the total-band per-snapshot light curve with
the highest value, multiplied by the |PowECFU| field, so does not
include uncertainties in the spectral modelling.
PowPeakUnabsFlux_neg
The 1-σ negative error on the maximum unabsorbed 0.3—10 keV flux for
the power-law spectrum indicated by the |whichPow| field. This is
taken from the bin in the total-band per-snapshot light curve with
the highest value, multiplied by the |PowECFU| field, so does not
include uncertainties in the spectral modelling.
APECECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming the APEC spectrum indicated by the
|whichPow| field.
APECECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming the APEC spectrum indicated by the
|whichPow| field.
APECFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming the APEC
spectrum indicated by the |whichPow| field.
APECFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux for the APEC
spectrum indicated by the |whichPow| field. This is taken from the
|band0Rate_pos| field multiplied by the |APECECFO| field, so does
not include uncertainties in the spectral modelling.
APECFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux for the APEC
spectrum indicated by the |whichPow| field. This is taken from the
|band0Rate_neg| field multiplied by the |APECECFO| field, so does
not include uncertainties in the spectral modelling.
APECPeakFlux
The maximum observed 0.3—10 keV flux (in erg cm^-2 s^-1 ) for the
APEC spectrum indicated by the |whichPow| field. This is taken from
the bin in the total-band per-snapshot light curve with the highest
value, multiplied by the |APECECFO| field.
APECPeakFlux_pos
The 1-σ positive error on the maximum observed 0.3—10 keV flux for
the APEC spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |APECECFO| field, so does not
include uncertainties in the spectral modelling.
APECPeakFlux_neg
The 1-σ negative error on the maximum observed 0.3—10 keV flux for
the APEC spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |APECECFO| field, so does not
include uncertainties in the spectral modelling.
APECUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming the
APEC spectrum indicated by the |whichPow| field.
APECUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux for the
APEC spectrum indicated by the |whichPow| field. This is taken from
the |band0Rate_pos| field multiplied by the |APECECFU| field, so
does not include uncertainties in the spectral modelling.
APECUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux for the
APEC spectrum indicated by the |whichPow| field. This is taken from
the |band0Rate_neg| field multiplied by the |APECECFU| field, so
does not include uncertainties in the spectral modelling.
APECPeakUnabsFlux
The maximum unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ) for the
APEC spectrum indicated by the |whichPow| field. This is taken from
the bin in the total-band per-snapshot light curve with the highest
value, multiplied by the |APECECFU| field.
APECPeakUnabsFlux_pos
The 1-σ positive error on the maximum unabsorbed 0.3—10 keV flux for
the APEC spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |APECECFU| field, so does not
include uncertainties in the spectral modelling.
APECPeakUnabsFlux_neg
The 1-σ negative error on the maximum unabsorbed 0.3—10 keV flux for
the APEC spectrum indicated by the |whichPow| field. This is taken
from the bin in the total-band per-snapshot light curve with the
highest value, multiplied by the |APECECFU| field, so does not
include uncertainties in the spectral modelling.
FixedPowECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming a power-law spectrum with a photon index of
1.7 absorbed by the Galactic column (from the |GalNH| field).
FixedPowECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming a power-law spectrum with a photon index of
1.7 absorbed by the Galactic column (from the |GalNH| field).
FixedPowFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field).
FixedPowFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux for a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field). This is taken from the
|band0Rate_pos| field multiplied by the |FixedPowECFO| field, so
does not include uncertainties in the spectral modelling.
FixedPowFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux for a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field). This is taken from the
|band0Rate_neg| field multiplied by the |FixedPowECFO| field, so
does not include uncertainties in the spectral modelling.
FixedPowUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field).
FixedPowUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux for a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field). This is taken from the
|band0Rate_pos| field multiplied by the |FixedPowECFU| field, so
does not include uncertainties in the spectral modelling.
FixedPowUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux for a
power-law spectrum with a photon index of 1.7 absorbed by the
Galactic column (from the |GalNH| field). This is taken from the
|band0Rate_neg| field multiplied by the |FixedPowECFU| field, so
does not include uncertainties in the spectral modelling.
FixedAPECECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming an APEC spectrum with a temperature of 1 keV
absorbed by the Galactic column (from the |GalNH| field).
FixedAPECECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), assuming an APEC spectrum with a temperature of 1 keV
absorbed by the Galactic column (from the |GalNH| field).
FixedAPECFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming an APEC
spectrum with a temperature of 1 keV absorbed by the Galactic column
(from the |GalNH| field).
FixedAPECFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux for an APEC
spectrum with a temperature of 1 keV absorbed by the Galactic column
(from the |GalNH| field). This is taken from the |band0Rate_pos|
field multiplied by the |FixedAPECECFO| field, so does not include
uncertainties in the spectral modelling.
FixedAPECFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux for an APEC
spectrum with a temperature of 1 keV absorbed by the Galactic column
(from the |GalNH| field). This is taken from the |band0Rate_neg|
field multiplied by the |FixedAPECECFO| field, so does not include
uncertainties in the spectral modelling.
FixedAPECUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), assuming an
APEC spectrum with a temperature of 1 keV absorbed by the Galactic
column (from the |GalNH| field).
FixedAPECUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux for an APEC
spectrum with a temperature of 1 keV absorbed by the Galactic column
(from the |GalNH| field). This is taken from the |band0Rate_pos|
field multiplied by the |FixedAPECECFU| field, so does not include
uncertainties in the spectral modelling.
FixedAPECUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux for an APEC
spectrum with a temperature of 1 keV absorbed by the Galactic column
(from the |GalNH| field). This is taken from the |band0Rate_neg|
field multiplied by the |FixedAPECECFU| field, so does not include
uncertainties in the spectral modelling.
InterpPowECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source,
interpolated on a look-up table of power-law spectra.
InterpPowECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source,
interpolated on a look-up table of power-law spectra.
InterpPowFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from the
hardness ratios of the source, interpolated on a look-up table of
power-law spectra.
InterpPowFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, interpolated on a look-up table
of power-law spectra. This is taken from the |band0Rate_pos| field
multiplied by the |InterpPowECFO| field, so does not include
uncertainties in the spectral modelling.
InterpPowFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, interpolated on a look-up table
of power-law spectra. This is taken from the |band0Rate_neg| field
multiplied by the |InterpPowECFO| field, so does not include
uncertainties in the spectral modelling.
InterpPowUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from
the hardness ratios of the source, interpolated on a look-up table
of power-law spectra.
InterpPowUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, interpolated on a look-up
table of power-law spectra. This is taken from the |band0Rate_pos|
field multiplied by the |InterpPowECFU| field, so does not include
uncertainties in the spectral modelling.
InterpPowUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, interpolated on a look-up
table of power-law spectra. This is taken from the |band0Rate_neg|
field multiplied by the |InterpPowECFU| field, so does not include
uncertainties in the spectral modelling.
InterpPowNH
The absorption column (in cm^-2 ) of the spectrum of the source
derived from the hardness ratios of the source, interpolated on a
look-up table of power-law spectra.
InterpPowNH_pos
The 1-σ positive error absorption column of the spectrum of the
source derived from the hardness ratios of the source, interpolated
on a look-up table of power-law spectra. A value of -1 indicates
that this error could not be constrained.
InterpPowNH_neg
The 1-σ negative error absorption column of the spectrum of the
source derived from the hardness ratios of the source, interpolated
on a look-up table of power-law spectra. A value of +1 indicates
that this error could not be constrained.
InterpPowGamma
The power-law photon index of the spectrum of the source derived
from the hardness ratios of the source, interpolated on a look-up
table of power-law spectra.
InterpPowGamma_pos
The 1-σ positive error on the power-law photon index of the spectrum
of the source derived from the hardness ratios of the source,
interpolated on a look-up table of power-law spectra. A value of -1
indicates that this error could not be constrained.
InterpPowGamma_neg
The 1-σ negative error on the power-law photon index of the spectrum
of the source derived from the hardness ratios of the source,
interpolated on a look-up table of power-law spectra. A value of +1
indicates that this error could not be constrained.
InterpAPECECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source,
interpolated on a look-up table of APEC spectra.
InterpAPECECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source,
interpolated on a look-up table of APEC spectra.
InterpAPECFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from the
hardness ratios of the source, interpolated on a look-up table of
APEC spectra.
InterpAPECFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, interpolated on a look-up table
of APEC spectra. This is taken from the |band0Rate_pos| field
multiplied by the |InterpAPECECFO| field, so does not include
uncertainties in the spectral modelling.
InterpAPECFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, interpolated on a look-up table
of APEC spectra. This is taken from the |band0Rate_neg| field
multiplied by the |InterpAPECECFO| field, so does not include
uncertainties in the spectral modelling.
InterpAPECUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from
the hardness ratios of the source, interpolated on a look-up table
of APEC spectra.
InterpAPECUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, interpolated on a look-up
table of APEC spectra. This is taken from the |band0Rate_pos| field
multiplied by the |InterpAPECECFU| field, so does not include
uncertainties in the spectral modelling.
InterpAPECUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, interpolated on a look-up
table of APEC spectra. This is taken from the |band0Rate_neg| field
multiplied by the |InterpAPECECFU| field, so does not include
uncertainties in the spectral modelling.
InterpAPECNH
The absorption column (in cm^-2 ) of the spectrum of the source
derived from the hardness ratios of the source, interpolated on a
look-up table of APEC spectra.
InterpAPECNH_pos
The 1-σ positive error absorption column of the spectrum of the
source derived from the hardness ratios of the source, interpolated
on a look-up table of APEC spectra. A value of -1 indicates that
this error could not be constrained.
InterpAPECNH_neg
The 1-σ negative error absorption column of the spectrum of the
source derived from the hardness ratios of the source, interpolated
on a look-up table of APEC spectra. A value of +1 indicates that
this error could not be constrained.
InterpAPECkT
The APEC plasma temperature (in keV) of the spectrum of the source
derived from the hardness ratios of the source, interpolated on a
look-up table of APEC spectra.
InterpAPECkT_pos
The 1-σ positive error on the APEC plasma temperature of the
spectrum of the source derived from the hardness ratios of the
source, interpolated on a look-up table of APEC spectra. A value of
-1 indicates that this error could not be constrained.
InterpAPECkT_neg
The 1-σ negative error on the APEC plasma temperature of the
spectrum of the source derived from the hardness ratios of the
source, interpolated on a look-up table of APEC spectra. A value of
+1 indicates that this error could not be constrained.
P_pow
If the (HR1,HR2) values of the source lie inside the range allowed
by the simple power-law spectrum, this field is 1. Otherwise it is
the probability of obtaining the measured hardness ratios and errors
if the true spectrum is that which gives (HR1,HR2) closest to the
source's values.
P_APEC
If the (HR1,HR2) values of the source lie inside the range allowed
by the simple APEC spectrum, this field is 1. Otherwise it is the
probability of obtaining the measured hardness ratios and errors if
the true spectrum is that which gives (HR1,HR2) closest to the
source's values.
FittedPowECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), from an automated
power-law spectral fit to an automatically-extracted spectrum of the
source.
FittedPowFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source. This is taken from the |band0Rate_pos| field
multiplied by the |FittedPowECFO| field, so does not include
uncertainties in the spectral modelling.
FittedPowFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source. This is taken from the |band0Rate_neg| field
multiplied by the |FittedPowECFO| field, so does not include
uncertainties in the spectral modelling.
FittedPowUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source.
FittedPowUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source. This is taken from the |band0Rate_pos| field
multiplied by the |FittedPowECFU| field, so does not include
uncertainties in the spectral modelling.
FittedPowUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source. This is taken from the |band0Rate_neg| field
multiplied by the |FittedPowECFU| field, so does not include
uncertainties in the spectral modelling.
FittedPowNH
The absorption column (in cm^-2 ) of the spectrum of the source from
an automated power-law spectral fit to an automatically-extracted
spectrum of the source.
FittedPowNH_pos
The 1-σ positive error absorption column of the spectrum of the
source from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowNH_neg
The 1-σ negative error absorption column of the spectrum of the
source from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowGamma
The power-law photon index of the spectrum of the source from an
automated power-law spectral fit to an automatically-extracted
spectrum of the source.
FittedPowGamma_pos
The 1-σ positive error on the power-law photon index of the spectrum
of the source from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowGamma_neg
The 1-σ negative error on the power-law photon index of the spectrum
of the source from an automated power-law spectral fit to an
automatically-extracted spectrum of the source.
FittedPowChi
The Churazov-weighted
χ^2 value of the
best fitting power-law spectral model.
FittedPowDOF
The number of degrees of freedom in the power-law spectral fit.
FittedPowRedChi
The Churazov-weighted
χ_ν ^2 value of
the best fitting power-law spectral model.
FittedAPECECFO
The counts-to-observed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source, from
an automated APEC spectral fit to an automatically-extracted
spectrum of the source.
FittedAPECECFU
The counts-to-unabsorbed-flux (0.3—10 keV) conversion factor (in erg
cm^-2 ct^-1 ), derived from the hardness ratios of the source, from
an automated APEC spectral fit to an automatically-extracted
spectrum of the source.
FittedAPECFlux
The observed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from the
hardness ratios of the source, from an automated APEC spectral fit
to an automatically-extracted spectrum of the source.
FittedAPECFlux_pos
The 1-σ positive error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, from an automated APEC spectral
fit to an automatically-extracted spectrum of the source. This is
taken from the |band0Rate_pos| field multiplied by the
|FittedAPECECFO| field, so does not include uncertainties in the
spectral modelling.
FittedAPECFlux_neg
The 1-σ negative error on the observed 0.3—10 keV flux derived from
the hardness ratios of the source, from an automated APEC spectral
fit to an automatically-extracted spectrum of the source. This is
taken from the |band0Rate_neg| field multiplied by the
|FittedAPECECFO| field, so does not include uncertainties in the
spectral modelling.
FittedAPECUnabsFlux
The unabsorbed 0.3—10 keV flux (in erg cm^-2 s^-1 ), derived from
the hardness ratios of the source, from an automated APEC spectral
fit to an automatically-extracted spectrum of the source.
FittedAPECUnabsFlux_pos
The 1-σ positive error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, from an automated APEC
spectral fit to an automatically-extracted spectrum of the source.
This is taken from the |band0Rate_pos| field multiplied by the
|FittedAPECECFU| field, so does not include uncertainties in the
spectral modelling.
FittedAPECUnabsFlux_neg
The 1-σ negative error on the unabsorbed 0.3—10 keV flux derived
from the hardness ratios of the source, from an automated APEC
spectral fit to an automatically-extracted spectrum of the source.
This is taken from the |band0Rate_neg| field multiplied by the
|FittedAPECECFU| field, so does not include uncertainties in the
spectral modelling.
FittedAPECNH
The absorption column (in cm^-2 ) of the spectrum of the source
derived from the hardness ratios of the source, from an automated
APEC spectral fit to an automatically-extracted spectrum of the source.
FittedAPECNH_pos
The 1-σ positive error absorption column of the spectrum of the
source derived from the hardness ratios of the source, from an
automated APEC spectral fit to an automatically-extracted spectrum
of the source.
FittedAPECNH_neg
The 1-σ negative error absorption column of the spectrum of the
source derived from the hardness ratios of the source, from an
automated APEC spectral fit to an automatically-extracted spectrum
of the source.
FittedAPECkT
The APEC plasma temperature (in keV) of the spectrum of the source
derived from the hardness ratios of the source, from an automated
APEC spectral fit to an automatically-extracted spectrum of the source.
FittedAPECkT_pos
The 1-σ positive error on the APEC plasma temperature of the
spectrum of the source derived from the hardness ratios of the
source, from an automated APEC spectral fit to an
automatically-extracted spectrum of the source.
FittedAPECkT_neg
The 1-σ negative error on the APEC plasma temperature of the
spectrum of the source derived from the hardness ratios of the
source, from an automated APEC spectral fit to an
automatically-extracted spectrum of the source.
FittedAPECChi
The Churazov-weighted
χ^2 value of the
best fitting APEC spectral model.
FittedAPECDOF
The number of degrees of freedom in the APEC spectral fit.
FittedAPECRedChi
The Churazov-weighted
χ_ν ^2 value of
the best fitting APEC spectral model.
------------------------------------------------------------------------
Cross-correlation information
There are 7 columns in this group. Show .
Numxcorr
The number of sources in the external catalogues against which we
performed cross-correlation, which are within 3-σ of the location of
this source. Where available, the uncertainty in the external
catalogue source position was added in quadrature with the 1SXPS
uncertainty to perform this match.
Numxcorr_slim
The number of sources in the external catalogues against which we
performed cross-correlation excluding 2MASS and USNO-B1, which are
within 3-σ of the location of this source. Where available, the
uncertainty in the external catalogue source position was added in
quadrature with the 1SXPS uncertainty to perform this match.
isROSHRI
Whether the object does (1) or does not (0) match an object in the
Rosat HRI
catalogue.
isROSPSPC
Whether the object does (1) or does not (0) match an object in the
Rosat PSPC
catalogue.
is3XMM
Whether the object does (1) or does not (0) match an object in the
3XMM DR4
catalogue.
isXMMSL1
Whether the object does (1) or does not (0) match an object in the
XMMSL1 XMM-Newton slew survey
catalogue.
isSwiftFT
Whether the object does (1) or does not (0) match an object in the
Swift-FT
catalogue.
is1SWXRT
Whether the object does (1) or does not (0) match an object in the
1SWXRT
catalogue.
isXRTGRB
Whether the object does (1) or does not (0) match a catalogued XRT
position of a Gamma Ray Burst .
isSDSSQSO
Whether the object does (1) or does not (0) match an object in the
SDSS QSO DR5
catalogue.
is2MASS
Whether the object does (1) or does not (0) match a 2MASS source
.
isUSNOB1
Whether the object does (1) or does not (0) match a USNO-B1
source.
isSIMBAD
Whether the object does (1) or does not (0) match a SIMBAD
object.
xcorrIDs
The identifiers of the external catalogue sources which are within
3-σ of the 1SXPS source, as a semi-colon delimited list of |object
(catalogue)| strings.
------------------------------------------------------------------------
------------------------------------------------------------------------
Detections Table
The /Detections/ table contains details of the specific detections that
comprise the catalogue. Each source in the Sources <#sourceTab> table
has at least one entry in this detections table; most sources have
multiple entries as they were detected in more than one band or dataset.
The information in the detections table relates to the specific
detection, not to the unique source as a whole. The fields in this
table, and their definitions are given below.
DetID
The unique identifier of this detection.
obsID
The unique identifier of the dataset in which the detection
occurred. If this number is less than 8000 it is the number of the
stacked image, otherwise it is a Swift obsid.
Band
The band in which this detection occurred, as an integer:
* *0*: Total band = 0.3—10 keV
* *1*: Soft band = 0.3—1 keV
* *2*: Medium band = 1—2 keV
* *3*: Hard band = 2—10 keV
DetFlag
The detection flag assigned for this specific detection. This is a
numerical value, normally 0 (=/Good/), 1 (=/Reasonable/) or 2
(=/Poor/) For sources which lie inside a region which was identified
in the manual screening stage as containing artefacts the flag
values are 8, 9 and 10 for the three categories. Those in a region
manually marked as containing diffuse emission have flag values of
16,17 and 18. In the case where the flag has a value >2 the /Good/,
/Reasonable/ or /Poor/ definitions indicate the strength of the
detection, however the source is highly likely nonetheless to be
spurious.
img_x
The |sky| x position of the source in the specific dataset and
energy band shown. For single observations, the nominal pointing
direction corresponds to |sky| coordinates (500.5,500.5). For
stacked images, (500.5,500.5) corresponds to the position of the
field given in the /Datasets/ table, but due to the nature of
stacked image, this gives no information about where on the detector
the source location was.
img_y
The |sky| y position of the source in the specific dataset and
energy band shown. For single observations, the nominal pointing
direction corresponds to |sky| coordinates (500.5,500.5). For
stacked images, (500.5,500.5) corresponds to the position of the
field given in the /Datasets/ table, but due to the nature of
stacked image, this gives no information about where on the detector
the source location was.
OffAxis
The mean off-axis angle (in arc minutes) of the source in this
specific dataset and energy band. This is calculated only from the
snapshot during which source is inside the field of view. A value of
-1 indicates that the source centre is never in the field of view
(i.e. it was detected and localised via the PSF wings).
RA
The Right Ascension (J2000) of the source as determined from this
specific dataset and energy band, using the astrometry from the
on-board star trackers.
RA_pos/RA_neg
These 2 columns give the 1-σ statistical error on the source RA,
determined from the PSF fit. For a small number of sources, the fit
code was unable to determine an error in which case this field is empty.
Decl
The declination (J2000) of the source as determined from this
specific dataset and energy band, using the astrometry from the
on-board star trackers.
Dec_pos/Dec_neg
These 2 columns give the 1-σ statistical error on the source
declination, determined from the PSF fit. For a small number of
sources, the fit code was unable to determine an error in which case
this field is empty.
Err90
The 90% confidence radial position error, including systematic
error, using the astrometry from the on-board star trackers. This is
derived from the RA and Decl errors above and has been converted to
90% confidence using Rayleigh statistics, with the the 3.5′′
astrometric systematic error from the star trackers added in
quadrature. For the sources where one of the individual RA/Dec
pos/neg errors was unavailable, the statistical radial 90%
confidence error was set to be 14.6′′/√C (where C is the number of
events used in the PSF fit) and the systematic error was combined
with this.
RA_corr
The Right Ascension (J2000) of the source, as determined from this
specific dataset and energy band, with the astrometry derived by
correlating the X-ray sources detected in this image with the 2MASS
catalogue.
Decl_corr
The declination (J2000) of the source, as determined from this
specific dataset and energy band, with the astrometry derived by
correlating the X-ray sources detected in this image with the 2MASS
catalogue.
Err90_corr
The 90% confidence radial position error, derived as for The |Err90|
field above, but where the systematic error is taken from the
X-ray/2MASS rectification process and not the on-board star trackers.
l,b
The Galactic co-ordinates of the source, in decimal degrees.
Counts
The total number of events (not background subtracted or exposure
corrected) at the location of the source. The size and shape of the
extraction region is a function of the source brightness and may
vary between datasets and energy bands.
BGCts
The total number of counts in the background map at the location of
the source. The size and shape of the extraction region is the same
as for the |Counts detected| field.
FieldExposure
The on-axis exposure time, in seconds, of the dataset in which this
detection occurred.
CF
The count-rate correction factor (κ in equation 9 of Evans et al.
2013 ) which corrects the count rate for vignetting, bad
columns, pile up and the finite radius over which counts were extracted.
Rate
The on-axis equivalent mean count-rate for the source in this
specific observation and energy band.
Rate_pos/neg
The 1-σ uncertainty in the count-rate. For sources with fewer than
30 detected events after background subtraction, this is calculated
using the Bayesian approach of Kraft, Burrows & Nousek (1991)
, other Poisson
statistics are employed.
ExposureFraction
The mean exposure time in the source extraction region as a fraction
of the on-axis exposure time in the image.
Cstat
The C statistic value from the PSF fit to the source.
Cstat_nosrc
The C-statistic value calculated for a model with no source present.
LogLikelihood
The log likelihood of the difference between |Cstat| and
|Cstat_nosrc| for 2 degrees of freedom being coincidence.
SNR
The signal-to-noise ratio of the source during the sliding cell
detection phase, when this source was detected.
Celldet_width
The full width (in pixels, 1 pixel=2.357′′) of the cell in which the
source was detected.
PSF_radius
The radius (in pixels) of the region used to perform the source PSF
fit and likelihood test.
PSF
The PSF profile used to determine the source position, likelihood
and count rate.
ol_warn
If a catalogued optical source bright enough to cause optical
loading at the level of ≥10^-3 ct s^-1 pix^-1 lies within 30′′ of
the position of this detection, this field records how many
magnitudes brighter than the level at which this optical loading
occurs that source is catalogued as being.
FieldFlag
The flag assigned to the dataset of this detection. This can be
either /Good/ (=0) or /Flagged/ (=1 or 2). The latter indicates that
there are artefacts (flag=1) and/or extended emission (flag=2) in
the field which may affect the flux levels of the point sources
detected.
NNDist
The distance in arc seconds to the nearest source also detected in
this dataset and energy band. If no other sources are detected this
is empty.
OKNNDist
The distance in arc seconds to the nearest source flagged as /Good/
or /Reasonable/ also detected in this dataset and energy band. If no
such sources are detected this is empty.
Num_snapshots
The number of snapshots in this dataset in which the source lies
within the field of view.
ImageBG
The mean background (in ct s^-1 pix^-1 ) of the image in which this
detection occurred.
MergeRadius
The radius (in pixels, 1 pix=2.357′′) around this detection of the
source within which detections are assumed to be aliases of the
source, and are thus discarded.
SourceID
The 1SXPS source of which this is a detection.
------------------------------------------------------------------------
------------------------------------------------------------------------
Datasets Table
The /Datasets/ table contains information about individual datasets —
observations and stacked images — which make up the 1SXPS catalogue.
ID
The unique identifier of the dataset. If this number is less than
8000 it is the number of the stacked image, otherwise it is a Swift
obsid.
RA
The Right Ascension (J2000.0) of the image centre in degrees.
Decl
The Right Ascension (J2000.0) of the image centre in degrees.
l,b
The Galactic coordinates of the image centre in degrees.
IsStacked
Whether this dataset is (1) or is not (0) a stacked image.
Exposure
The on-axis exposure time of the dataset, in seconds.
FieldBG_band0
The mean background value in the total (0.3—10 keV) band in ct s^-1
pix^-1 . This is measured from the background map before the
detected sources have been added to it.
Field BG_band1
The mean background value in the soft (0.3—1 keV) band in ct s^-1
pix^-1 . This is measured from the background map before the
detected sources have been added to it.
Field BG_band2
The mean background value in the medium (1—2 keV) band in ct s^-1
pix^-1 . This is measured from the background map before the
detected sources have been added to it.
Field BG_band3
The mean background value in the hard (2—10 keV) band in ct s^-1
pix^-1 . This is measured from the background map before the
detected sources have been added to it.
Numsrc_band0
The number of sources detected in the total (0.3—10 keV) band image
of this dataset.
Numsrc_band1
The number of sources detected in the soft (0.3—1 keV) band image of
this dataset.
Numsrc_band2
The number of sources detected in the medium (1—2 keV) band image of
this dataset.
Numsrc_band3
The number of sources detected in the hard (1—10 keV) band image of
this dataset.
NumOK_band0
The number of /Good/ and /Reasonable/ sources detected in the total
(0.3—10 keV) band image of this dataset.
NumOK_band1
The number of /Good/ and /Reasonable/ sources detected in the soft
(0.3—1 keV) band image of this dataset.
NumOK_band2
The number of /Good/ and /Reasonable/ sources detected in the medium
(1—2 keV) band image of this dataset.
NumOK_band3
The number of /Good/ and /Reasonable/ sources detected in the hard
(1—10 keV) band image of this dataset.
MedianNNDist_band0
The median distance between sources detected in the total (0.3—10
keV) band image of this dataset, in arc seconds.
MedianNNDist_band1
The median distance between sources detected in the soft (0.3—1 keV)
band image of this dataset, in arc seconds.
MedianNNDist_band2
The median distance between sources detected in the medium (1—2 keV)
band image of this dataset, in arc seconds.
MedianNNDist_band3
The median distance between sources detected in the hard (2—10 keV)
band image of this dataset, in arc seconds.
Date_start
The UT date at time at which the observation began. For stacked
images this is the time of the first observation within the stacked
image.
Date_stop
The UT date at time at which the observation began. For stacked
images this is the time of the first observation within the stacked
image.
FieldFlag
The flag assigned to the field by manual inspection. This can be
either /Good/ (=0) or /Flagged/ (=1 or 2). The latter indicates that
there are artefacts (flag=1) and/or extended emission (flag=2) in
the field which may affect the flux levels of the point sources
detected.
NumSnapshots
The number of snapshots in the dataset.
AstromErr
If the astrometry of this image could be determined by matching the
XRT sources with the 2MASS catalogue, this gives the 90% confidence
radial error associated with that astrometry.
Stacked image
For observations this gives the ID of the stacked image to which the
observation contributes (if any). For stacked images, this gives the
ID of any other stacked images which overlap this dataset.
------------------------------------------------------------------------
------------------------------------------------------------------------
Cross Correlations Table
The /Cross correlations/ table contains details of the cross correlation
between the 1SXPS sources and other catalogues.
1SXPS_ID
The name of the source in the 1SXPS catalogue.
ExtCat_ID
The name of the matched source in the external catalogue.
Catalogue
The name of the catalogue in which the match occurs.
Distance
The distance, in arc seconds, between the 1SXPS source and the
external catalogue source.
RA
The Right Ascension (J2000), in decimal degrees, of the source in
the external catalogue.
Decl
The declination (J2000), in decimal degrees, of the source in the
external catalogue.
Err90
The 90% confidence radial error in the external catalogue position
(if available). Where necessary, this has been converted from a 1-σ
error using Rayleigh statistics, and has had any relevant systematic
error added.
UK Swift Science Data Centre Last updated 2013 November 21
Web page maintained by Phil Evans
E-mail: swift help