ADS Astronomy Abstract Service

Title:
The GB6 Catalog of Radio Sources
Authors:
GREGORY, P. C.; SCOTT, W. K.; DOUGLAS, K.; CONDON, J. J.
Journal:
Astrophysical Journal Supplement v.103, p.427
Publication Date:
04/1996
Origin:
APJ
ApJ Keywords:
CATALOGS, RADIO CONTINUUM: GALAXIES, SURVEYS
Bibliographic Code:
1996ApJS..103..427G

Abstract

The Green Bank 4.85 GHz (lambda ~ 6 cm) survey was made with the NRAO seven-beam receiver on the (former:) 91 m telescope during November 1986 and October 1987. The final set of sky maps covering the declination band 0 degrees < delta < +75 degrees was constructed with data from both epochs. Its noise and position errors are nearly a factor of root-2 smaller than in the 1987 maps, from which the 87GB catalog of 54,579 sources stronger than S ~ 25 mJy (Gregory & Condon 1991) was extracted. We therefore used the new maps to make the GB6 catalog (Gregory et al. 1995) of 75,162 discrete sources with angular sizes phi < 10.5 arcmin and flux densities > 18 mJy. This catalog is available in machine-readable versions with either B1950 or J2000 positions and as a printed book with B1950 positions. The GB6 weighted differential source counts (S^2.5)n(S) between 18 mJy and 7 Jy agree well with evolutionary models based on independent data.