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1998A&AS..127..145Bade+
ftp.hs.uni-hamburg.de/pub/outgoing/rass-id
A452 1998A&AS..127..145Bade+ The Hamburg/RASS Catalogue of optical
CATS identifications (ftp.hs.uni-hamburg.de/pub/outgoing/rass-id 6/98)
Comment: RADECJ, opt.class for ~15000 cands for 4665 RASS sources
2 Files: 205x79+152021x86 = 1.06 Mb
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| The Hamburg/RASS Catalogue of Optical Identifications |
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N. Bade (1), D. Engels (1), W. Voges (2), V. Beckmann (1), Th. Boller (2),
L. Cordis (1), M. Dahlem (3), J. Englhauser (2), K. Molthagen (1),
P. Nass (1,2), J. Studt (1), D. Reimers (1)
(1) Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg
(2) MPI fuer Extraterrestrische Physik, D-85740 Garching
(3) ESTEC, Astrophysics Division, Postbus 299 ,NL-2200 AG Noordwijk
Version 2.0, issued January 5, 1998 now 4665 positions,
Version 1.1, issued December 5, 1996 additional entries in the X-ray rows
(flags and date of last change)
Version 1.0, issued November 1, 1996
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GENERAL DESCRIPTION
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The file rass2id.cat provides information on optical identifications
to X-ray positions of the ROSAT All-Sky Survey (RASS). The file was created
by correlating the Bright Source Catalogue of ROSAT (Voges et al., 1996) and
the Hamburg/RASS Catalogue of Optical Identifications (HRC) (Bade et al.,
1996, in prep.). In the current state (Version 2.0) the catalogue
contains 4665 positions in the extragalactic northern sky. For each
X-ray position optical information taken from HQS objective prism and
direct Schmidt plates (Hagen et al., 1995, A&AS 111, 195) is given and
a finding chart derived from digitized direct plates as gzipped
Postscript file is provided. If possible, the most likely optical
counterpart is marked in the catalogue and on the finding chart.
For many of the newly processed HQS fields of Version 2.0 no direct
Schmidt plates from the HQS exists. In these cases we put finding
charts generated from the STScI Digitized Sky Survey on the ftp
server. We remind the reader that the STScI Digitized Sky Survey and
HQS prism plates have different epochs. This has to be taken into
account for stellar identifications. Furthermore the spectral
sensitivity of the STScI Digitized Sky Survey and the HQS prism
plates is different.
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CONTENTS
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X-RAY ROWS
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The rows containing the X-ray information can be recognized by 'RX' in the
second and third column. They have the following structure:
Bytes Format Units Explanations
1-16 A16 Object name
19-20 I2 R.A.: hours (2000.0)
22-23 I2 R.A.: minutes (2000.0)
25-28 F4.1 R.A.: seconds (2000.0)
31-33 I3 Decl.: degree (2000.0)
35-36 I2 Decl.: minutes (2000.0)
38-39 I2 Decl.: seconds (2000.0)
43-45 I3 arcseconds error radius derived from the BSC
51-56 I6 internal number
62-64 I3 identification code
69 I1 flag, if set to 1, identification changed
since last catalogue version
70 I1 flag, if set to 1, entries to this X-ray
position have changed since last
catalogue version,
71 I1 flag, supplementary X-ray positions are
flagged with 1
74-79 A6 date of last change
The identification code is defined as follows:
The first (and third) digit give(s) the classification:
1 AGN
2 Galaxy, derived from the morphology on the direct plates
3 Cluster
5 M dwarf
6 White Dwarf
7_1 K Dwarf
7_2 F or G star
7_3 Cataclysmic Variable (CV)
7_4 Bright Star (B < 13)
8 no plausible candidate found
803 one object in favourable position, but no spectral information
0 empty field on objective prism and direct plate within a radius
of at least 40 arcsec
The second digit in the identification code describes the reliability of the
given identification:
0 'highly probable', the proposed counterpart fulfills all requirements
of its class and no other plausible counterpart within the error
radius of the X-ray source exists
1 'probable', the proposed counterpart fulfills the requirements of
its class, but there are limitations. Either, the objective spectrum
is not typical, or there are small conflicts with the X-ray
information (spectral or spatial information, distance to the
X-ray position) or there is another (considerably less) plausible
counterpart in the error circle
2 'possible', the proposed counterpart fulfills some requirements of
its class, but there are doubts arising from insufficient objective
prism data, conflicting X-ray data or another plausible candidate
FINDING CHARTS
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The finding chart for each X-ray position is stored as
a gzipped Postscript file and they can be found in the
directories d-10 to d+80. These directories arrange the
files into declination belts. Names of finding charts
generated by the STScI Digitized Sky Survey begin with a
'p'.
OPTICAL ROWS
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Below the X-ray information rows with optical data
about objects in the error circle follow.
These lines have the following structure:
Bytes Format Units Explanations
14-16 I3 Number, a '+' in front of the
number marks the proposed
optical counterpart
19-20 I2 R.A.: hours (2000.0)
22-23 I2 R.A.: minutes (2000.0)
25-28 F4.1 R.A.: seconds (2000.0)
31-33 I3 Decl.: degree (2000.0)
35-36 I2 Decl.: minutes (2000.0)
38-39 I2 Decl.: seconds (2000.0)
42-45 I4 arcseconds X-ray position - optical position
in right ascension
48-51 I4 arcseconds X-ray position - optical position
in declination
55-57 I3 arcseconds distance between X-ray and
optical position
62-65 F4.1 Optical magnitude B
a '<' on column 61 means upper limit
for magnitude, the object is saturated
'>19.0' in column 61-65 means, that the
optical counterpart is only visible
on the direct plate not on the prism
plate(s)
no entry means no B magnitude available
77-84 A8 Classification for objective
prism spectrum
For the classification of objective prism spectra the following scheme
was adopted:
SUBDWARF Hot Subdwarfs (sdO,sdB)
W-DWARF White Dwarfs
STAR-BA Balmer absorption lines, point-like image
STAR-FG G-Band, Ca H+K, point-like image
STAR-K G-Band, Ca H+K, redder continuum, point-like image
STAR-M Very red, TiO lines, Ca I 4226, point-like image
CV Cataclysmic variable, Balmer emission lines
GALAXY Extended image on direct plate, no emission lines,
red continuum
AGN Emission line(s), blue continuum, weak extension on
direct plate allowed
BLUE GAL moderately blue continuum, extended image on direct plate
QSO Emission line(s), extremely blue continuum,
no extension on direct plate
EBL-WK Extremely blue continuum, weak point-like object
BLUE-WK Moderately blue continuum, weak point-like object
RED-WK Red continuum, weak point-like object
UNIDENT Classification open
OVERLAP Classification not possible due to overlapping spectra
SATURATE Classification not possible due to amplifier saturation
The catalogue can be used for scientific purposes if the above mentioned
paper is referenced.
For more detailed information about the identification code and the
classification scheme for objective prism spectra the catalogue user is
also referred to this paper.
Acknowledgements:
The ROSAT project is supported by the Ministerium fuer Bildung,
Wissenschaft, Forschung und Technologie (BMBF/DARA) and by the
Max-Planck-Gesellschaft (MPG).
This research has made use of the NASA/IPAC Extragalactic Database (NED)
which is operated by the Jet Propulsion Laboratory, California Institute
of Technology, under contract with the National Aeronautics and Space
Administration.
This work has been funded by the Deutsche Forschungsgemeinschaft under
Re 353/22-1 to 4 and by the BMBF under DARA 50\,0R\,96016.
The STScI Digitized Sky Surveys were produced at the Space Telescope
Science Institute under U.S. Government grant NAG W-2166. The
images of these surveys are based on photographic data obtained
using the Oschin Schmidt Telescope on Palomar Mountain and the UK
Schmidt Telescope. The plates were processed into the present
compressed digital form with the permission of these institutions.
The National Geographic Society - Palomar Observatory Sky Atlas
(POSS-I) was made by the California Institute of Technology with
grants from the National Geographic Society.
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-rw-r--r-- 1 3014 750 997316 Aug 31 1999 rass2idv1_1.cat
-rw-r--r-- 1 3014 750 64103 Aug 31 1999 rass2idv1_1_sky.ps.gz
-rw-r--r-- 1 3014 750 1242801 Aug 31 1999 rass2idv2_0.cat