1990MNRAS.246..110McGilchrist+

1995A&AS..110..419Visser+

1995MNRAS.276..614Lacy+

1996MNRAS.282..779Waldram+

1999MNRAS.306...31Riley+

The 7C survey covers most of the northern hemisphere above a declination of 20d, but generally away from the Galactic plane, at 151 MHz, with a resolution of 70x70cosec(declination) arcsec**2 (EWxNS) (i.e., about four times better resolution than the 6C survey).

The published portions of this survey are:

- regions centred at 10h28m, 41d and 6h28m, 45d

**McGilchrist et al. 1990 MNRAS, 246, 110;** - a region centred at 17h, 65d

**Visser et al. 1995, A&AS, 110, 419;** - a region centred at 18h, 66d

**Lacy et al. 1995, MNRAS, 276, 614;** - a region covering 9h to 16h, 20d to 36d,

**Waldram et al. 1996, MNRAS, 282, 779**(erratum 284, 1007); - a region covering 9h to 16h, 20d to 36d,

**Waldram et al. 1996, MNRAS, 282, 779**(erratum 284, 1007); - 33 regions in the range 7h<RA<17h,30d<DE<58d

**1999MNRAS.306...31Riley, Waldram & Riley:**

The published paper contains source lists on microfiche. Versions of this papers with the lists on paper are available on request from MRAO.

Some source lists are available in computer readable form by ftp, or from NSSDC's Online Data and Information Service (NODIS), and are searchable on line via the Einstein On-Line Service (Einline) of the Smithsonian Astrophysical Observatory, and the DIRA2 service at Bologna. Other source lists (and images) of other regions, although not yet published, may be available on request.

1990MNRAS..246..110McGilchrist+

1 Description Description of catalog 2 Field List A general listing of all the fields in the catalog 3 Example Example SQL query to the catalog with expected results 4 References 5 Additional Information 6 Further Acknowledgements 7 Appendix 8 Filename Document URL 9 Origin Origin of catalog 10 Date Catalog creation date 11 Revised Last revision date 12 Columns Number of columns or fields in the catalog 13 Rows Number of rows or entries in the catalog 14 Time Period Time period for which catalog data are available 15 Other Any additional information concerning the physical attributes of the catalog 16 Contact Addresses for further information 17 Keywords Keywords

1 ra_rad radians Right ascension of source in radians (B1950) (real, example: 1.747184) 2 dec_rad radians Declination of source in radians (B1950) (real, example: 0.789712) 3 ra_deg degrees Right ascension of source in degrees (B1950) (real, example: 100.106293) 4 dec_deg degrees Declination of source in degrees (B1950) (real, example: 45.247169) 5 s_151 Jy Flux density of source at 151 MHz (real, example: 0.555) 6 size arcsec Angular size (real, example: 144.95) 7 pa degrees Position angle (int, example: 204) 8 num_pix No. of pixels used to calculate integrated flux density (int, example: 40) 9 class Source classification - Morphological type (char3, example: 'PT' or 'E') 10 class_flg Quality of source classification (char1, example: '.' or '*' or '?' etc.) 11 field Code as to which field contains source (int, example: 1) 12 atten Primary beam attenuation (real, example: 0.979) 13 aberr Depression in height of beam due to aberration (real, example: 0.953) 14 hi_pix Jy/beam Value of highest pixel in source in Jy/beam (real, example: 0.341) 15 pos_mthd Method used to determine position (char2, example: 'Pr' or 'Us') 16 flx_mthd Method used to determine flux density (char2, example: 'Cn' or 'Dy') 17 siz_mthd Method used to determine angular size and PA (char2, example: 'Us' or 'a')

sqrt [1^2 + (1/S)^2] arcsec for sources near the calibrator to approx.

sqrt [3^2 + (1/S)^2] arcsec at the greatest distance from it.

The corresponding errors in Dec are

sqrt [1^2 + (cosec dec/S)^2] arcsec to approx.

sqrt [3^2 + (cosec dec/S)^2] arcsec

where S is the flux density in Jy.

Example (ra_rad) (real): 1.747184

Example (dec_rad) (real): 0.789712

Example (ra_deg) (real): 100.106293

Example (dec_deg) (real): 45.247169

Example (s_151) (real): 0.555

Example (size) (real): 144.95

Example (pa) (int): 204

Example (num_pix) (int): 40

Example (hi_pix) (real): 0.341

- PT point
- E extended
- EC extended complex
- DE equal double
- DUn unequal double, the flux densities of the components being in the ratio n:1
- DC double complex
- HT head tail.

- . firm classification
- ? uncertain classification
- % slightly confused but firm classification
- # slightly confused, uncertain classification
- + confused but firm classification
- * confused, uncertain classification

1 0647+45 2 0608+45 3 1004+46 4 1046+46 5 1046+36 6 1012+36See the paper for details on field centers and calibrator positions.

Example (field) (int): 1

Example (atten) (real): 0.979

Example (aberr) (real): 0.953

- Dy The position was found from an iterative least-squares fit to the synthesized beam. The algorithm runs automatically and is used for point sources; it is not suitable for complex sources.
- Pr The data around the peak are interpolated on to a much finer grid, and the position of the maximum on this fine grid is taken; if a source has more than one peak, the position adopted is the unweighted mean of all the peak positions.
- Us For a very complex source, the position given is that at which the optical identification is most likely to be found.

- Dy The flux density was found from an iterative least-squares fit to the synthesized beam. The algorithm runs automatically and is used for point sources; it is not suitable for complex sources.
- I The pixels above a certain level are summed; in addition, the sum is converted to a flux density using an appropriate normalization factor.
- P The pixels above a certain level are summed; in addition the immediate neighbors of the outermost points are included. The sum is converted to a flux density using an appropriate normalization factor.
- Sf A rotationally symmetric representation of the synthesized beam is fitted to the source profile with height and zero-level as the only parameters; pixels with values substantially different from those expected are not included in the fitting procedure.
- Cn The area covered by the source is CLEANed down to the noise level, using the local synthesized beam as the dirty beam; the flux density is the sum of the clean components.

- Us The user selects two points on a contour map of the source. The angular size is the angular separation of these points and the position angle is that of the line joining them. For complex sources the size is generally the largest angular size; for those with only one peak it is typically the full width at half maximum in the direction of maximum extension, corrected for beam broadening.
- a This is only used for sources with two or more peaks. The angular size is the angular distance between the two most widely separated peaks; the position angle is that of the line joining them.

1995A&AS..110..419V

1995MNRAS.276..614L

from ADS Astronomy Abstract Service

1996MNRAS.282..779W

VIII/XXXX 7C 151-MHz surveys at 1005+53, 1042+57, 1332+38 (Pooley+ 1998) =========================================================================== The 7C Survey of Radio Sources at 151 MHz: three regions centred at RA 10h 05m, Dec 53deg 54m; RA 10h 42m, Dec 57deg 36m; RA 13h 32m, Dec 38deg 10m Pooley D.M., Waldram E.M., Riley J.M.Back to CATS manual=1998MNRAS,298..637P (SIMBAD/NED BIBCODE) =========================================================================== ADC_Keywords: Radio sources ; Surveys Keywords: catalogues - surveys - radio continuum: general Description: The Cambridge Low Frequency Synthesis Telescope has been used at 151 MHz to survey three regions centred at RA 10h 05m,Dec 53deg 54m, RA 10h 42m,Dec 57deg 36m and RA 13h 32m,Dec 38deg 10m, each of area 7.3 x 7.3cosec(dec) deg^2^. The resolution is 70 x 70cosec(dec) arcsec^2^, and the rms noise on the maps is typically 15mJy beam^-1^. We present positions and flux densities for 2381 sources which have signal-to-noise ratios > 5.5. The RAxDec coverage, average rms noise, flux density of the faintest source listed and completeness limit for each region catalogued are given in the table below. All coordinates are equinox B1950. -------------------------------------------------------------------------- Region Coverage RA x Dec (see notes*) av.rms noise Sfaint Scomp -------------------------------------------------------------------------- 1005+53 09h40m-10h30m;49deg05m-58deg20m 15mJy 50mJy 170mJy 1042+57 10h10m-11h10m;53deg00m-61deg45m 13mJy 50mJy 150mJy 1332+38 13h15m-13h50m;31deg40m-43deg45m 14mJy 50mJy 200mJy -------------------------------------------------------------------------- *Note: RA coverage is indicated by approx RA range at Dec of field centre *Note: Dec coverage is indicated by approx Dec range at RA of field centre -------------------------------------------------------------------------- 1-sigma errors on the listed source positions may be approximated by: Right Ascension error(arcsec) = SQRT(1.0**2 + (32/SNR)**2) Declination error(arcsec) = 1.3cosec(dec) x (RA error) and 1-sigma errors on the listed flux densities may be approximated by: Error on S beam-fitted(Jy) = SQRT(0.03**2 + SNR**-2) x S(Jy) Error on Sint(Jy) = 1.5 x SQRT(0.03**2 + SNR**-2) x Sint(Jy) where SNR, S and Sint correspond to the columns denoted by those names in the byte-by-byte description below. For multi-component sources the SNR for the brightest component is used to estimate the Sint error. For further details of the surveys and data analysis procedures please refer to the published paper referenced at the head of this file. File Summary: ---------------------------------------------------------------------------- FileName Lrecl Records Explanations ---------------------------------------------------------------------------- ReadMe 80 . This file 100553.dat 74 743 7C sourcelist of 743 sources 104257.dat 74 757 7C sourcelist of 757 sources 133238.dat 74 881 7C sourcelist of 881 sources 7C_Pooley.dat 74 2281 Sum 7C sourcelist of 2281 sources (CATS) ----------------------------------------------------------------------------- Byte-by-byte Description of file: *.dat ----------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Beam-fitted position right ascension B1950 4- 5 I2 min RAm Beam-fitted position right ascension B1950 7- 10 F4.1 s RAs Beam-fitted position right ascension B1950 12 A1 - DE- Beam-fitted position declination (sign) 13- 14 I2 deg DEd Beam-fitted position declination B1950 16- 17 I2 arcmin DEm Beam-fitted position declination B1950 19- 20 I2 arcsec DEs Beam-fitted position declination B1950 24- 25 I2 h RACh Centroid position right ascension B1950 27- 28 I2 min RACm Centroid position right ascension B1950 30- 33 F4.1 s RACs Centroid position right ascension B1950 35 A1 - DEC- Centroid position declination (sign) 36- 37 I2 deg DECd Centroid position declination B1950 39- 40 I2 arcmin DECm Centroid position declination B1950 42- 43 I2 arcsec DECs Centroid position declination B1950 47- 52 F6.2 Jy/beam S Beam-fitted flux density 54- 59 F6.2 Jy Sint Integrated flux density 61- 65 F5.1 --- SNR Signal-to-noise ratio 67- 70 F4.1 --- Extent Extent of the source in units of local beam area 74 I1 --- Nmax Number of local maxima within the integrated region -------------------------------------------------------------------------------- ================================================================================ (End) Sally Hales [MRAO] 20-Oct-1998 ================================================================================ 1999MNRAS.306...31Riley, Waldram & Riley: The 7C survey of radio sources at 151 MHz: 33 regions in the range 7h<RA<17h,30d<DE<58d (ctsy. S.Hales 5/99) 33 files merged and marked with the field name in the first column (H.Andernach 5/99) total of 19226 entries; S151_bf_max=85206 mJy; S151_int=84716 mJy Fieldnam RADEC_bf_B1950 RADEC_cen_B1950 S151_bf _int/mJy S/N Ext Nmax ----+----1----+----2----+----3----+----4----+----5----+----6---- 0722+45 070011.1+482817 070011.1+482819 825 891 23.2 1.1 1 0722+45 070021.3+480907 070021.7+480909 274 311 10.1 1.3 1