[AIPS] [NRAO] AIPS NVSS and WENSS Tables



This document was most recently updated at $Date: 2007/10/29 21:13:50 $ (UT).


Description

The NVSS or NRAO VLA Sky Survey was conducted by James Condon, Bill Botton, and others. They have made images of the whole sky visible with the VLA, observing at 21-cm wavelength with the D (most compact) array configuration. In addition to the images, they have also made a catalog of nearly 2000000 sources. We have written task SETFC to use this catalog to prepare input to the imaging task IMAGR, task FACES to model a region of sky based on the sources in the catalog, and task BOXES to prepare Clean boxes to surround the source in a catalog. These tasks use the catalog in a very compact form, 1 line per source with right ascension and declination in degrees and flux in mJy. All data files except the largest are included in the standard AIPS release in an area identfied with the logical name $AIPSTARS. These files are also made available through this web page, which is the only way to obtain the very largest (font color red).

The J2000 coordinate files are

  1. Fluxes greater than 1000 mJy (0.06 MBytes) or gzip'ed (0.03 MBytes).
  2. Fluxes greater than 300 mJy (0.4 MBytes) or gzip'ed (0.16 MBytes).
  3. Fluxes greater than 100 mJy (1.7 MBytes) or gzip'ed (0.6 MBytes).
  4. Fluxes greater than 30 mJy (6.4 MBytes) or gzip'ed (2.3 MBytes).
  5. Fluxes greater than 3 mJy (40.2 MBytes) or gzip'ed (13.5 MBytes).

The B1950 coordinate files are

  1. Fluxes greater than 1000 mJy (0.06 MBytes) or gzip'ed (0.03 MBytes).
  2. Fluxes greater than 300 mJy (0.4 MBytes) or gzip'ed (0.16 MBytes).
  3. Fluxes greater than 100 mJy (1.7 MBytes) or gzip'ed (0.6 MBytes).
  4. Fluxes greater than 30 mJy (6.4 MBytes) or gzip'ed (2.3 MBytes).
  5. Fluxes greater than 3 mJy (40.2 MBytes) or gzip'ed (13.5 MBytes).

The Westerbork Northern Sky Survey (WENSS) is a low-frequency radio survey that covers the whole sky north of delta=30 degrees at a wavelength of 92 cm to a limiting flux density of approximately 18 mJy (5 sigma). WENSS is a collaboration between the Netherlands Foundation for Research in Astronomy (NFRA/ASTRON) and the Leiden Observatory. Ger de Bruyn, George Miley, Roeland Rengelink, Yuan Tang, Malcolm Bremer, Huub Rottgering, Ernst Raimond, Martin Bremer, and David Fullagar. See for more information. See alsoRengelink et al. 1997 A&A Supplement Ser., Vol. 124, 259-280 or email wenss.people@strw.leidenuniv.nl.

The Westerbork Southern Hemisphere Survey covers -25 to -15 degrees in declination with some sources to -9 degrees. It is now included in the WENSS data files.

The WENSS/WISH table, formatted for SETFC, FACES, and BOXES, contains 82619 entries as shipped with AIPS. The larger file, available only through this web page, contains a total 301125 sources. The smaller file now contains 85510 sources and is shipped with the usual AIPS release. The WE files were corrected on 2 July 2004 to have a correct numeric sort and to omit 18650 "sources" that appear in the WENSS and WISH catalogs twice, once as a number of components and once as a "multiple" source. The latter are now omitted.

  1. With J2000 coordinates (2.2 MBytes) or gzip'ed (0.8 MBytes).
  2. With B1950 coordinates (2.2 MBytes) or gzip'ed (0.8 MBytes).
  3. With J2000 coordinates (8.0 MBytes) or gzip'ed (2.6 MBytes).
  4. With B1950 coordinates (8.0 MBytes) or gzip'ed (2.6 MBytes).

Eric W. Greisen