This document was most recently updated at $Date: 2007/10/29 21:13:50 $ (UT).
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
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
The B1950 coordinate files are
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 firstname.lastname@example.org.
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.