Astrophysics Group

7C

The Seventh Cambridge (7C) Survey of Radio Sources

The main 7C survey at 151 MHz with resolution 70Ó?70Òšcosec(declination)Òšarcsec² (EWÓ?NS) covers a large part of the northern hemisphere above declination 30ÒÀ, excluding the Galactic plane.There is now a final unified non-redundant catalogue for this main survey in ASCII format together with a CDS-style ReadMe file, both available by ftp from MRAO. The catalogue has been constructed from the 100 or so survey fields analysed in the series of papers detailed below. The sensitivity of the survey is not uniform so, as well as describing the data format, the ReadMe file gives some guidance on the limiting flux density and completeness each of the individual catalogues from these contributing fields. A paper describing the construction of the final catalogue has been submitted to MNRAS.

Note that there are completely separate 7C catalogues for the Northern Galactic Plane 7C(G) and for the lower-resolution LOW-DEC 7C survey (see below).

The individual 7C source lists used in the construction of the main catalogue are available here at MRAO in a standardised format;Òš you can retrieve all of them by ftp or single sections from the ftp link beside each section below.

(Note that the lowdec survey at intermediate resolution 108Ó?108Òšcosec(dec)Òšarcsec² is a separate entity and has its own standard format.)

Caveat ! Òš Journal tables retrievable from the data centres and via the literature reference links listed below are in the same format as printed in the journal (where applicable), which in some cases will be non-standard with respect to the overall survey.

Regions surveyed at resolution 70Ó?70 cosec(dec) arsec², ftp accesses standardised data:

• Regions centred at 10^h28^m, 41ÒÀ and 6^h28^m, 45ÒÀ – the analysis described by
  McGilchrist et al. 1990 MNRAS, 246, 110
  has been superseded by a more up-to-date analysis using standard 7C analysis methods and these data are now included in Riley et al. (2001) below;
• A region centred at 17^h, 65ÒÀ: ftp;
  Visser et al. 1995, A&AS, 110, 419;
• A region centred at 18^h, 66ÒÀ: ftp;
  Lacy et al. 1995, MNRAS, 276, 614;
• Three regions centred at 10^h05^m, 53ÒÀ54′ and 10^h42^m, 57ÒÀ36′ and 13^h32^m, 38ÒÀ10′: ftp:
  Pooley et al. 1998, MNRAS, 298, 637.
• Thirty three regions in the range 7^h to 17^h, 58ÒÀ to 30ÒÀ: (as separate files or tar) ftp;
  Riley et al. 1999, MNRAS, 306, 31.
• A further fifty eight regions: (as separate files or tar) ftp;
  released electronically by Riley et al. (2001).

LOW-DEC SURVEY

Surveyed at resolution 108 x 108cosec(dec) arcsec² and with its own standard format:

• A region covering 9^h to 16^h, 20ÒÀ to 35ÒÀ: ftp;
  Waldram et al. 1996, MNRAS, 282, 779 (erratum 284, 1007);

Julia Riley/MRAO, Cambridge/julia@mrao.cam.ac.uk
Sally Hales/MRAO, Cambridge/segh@mrao.cam.ac.uk
Elizabeth Waldram/MRAO, Cambridge/emw1@mrao.cam.ac.uk