The Angular TwoPoint Correlation Function for the FIRST Radio Survey
Abstract
The FIRST (Faint Images of the Radio Sky at Twenty centimeters) survey now covers 1550 deg^2^ of sky, where 07^h^16 <~ α <~ 17^h^40 and 28.3^deg^ <~ δ <~ 42^deg^. This yields a catalog of 138,665 sources above the survey threshold of 1 mJy, about onethird of which are in doublelobed and multicomponent sources. We have used these data to obtain the first highsignificance measurement of the twopoint angular correlation for a deep radio sample. We find that the correlation function between 0.02^deg^ and 2^deg^ is well fitted by a power law of the form Aθ^{gamma}^, where A ~ 3 x 10^3^ and γ ~ 1.1. On small scales (θ < 0.2^deg^), double and multicomponent sources are shown to have a larger clustering amplitude than that of the whole sample. Sources with flux densities below 2 mJy are found to have a shallower slope than that obtained for the whole sample, consistent with there being a significant contribution from starbursting galaxies at these faint fluxes. The crosscorrelation of radio sources and Abell clusters is determined. A preliminary approach to inferring spatial information is outlined.
 Publication:

The Astrophysical Journal
 Pub Date:
 December 1996
 DOI:
 10.1086/178122
 arXiv:
 arXiv:astroph/9606176
 Bibcode:
 1996ApJ...473....7C
 Keywords:

 COSMOLOGY: THEORY;
 GALAXIES: CLUSTERS: GENERAL;
 GALAXIES: STATISTICS;
 COSMOLOGY: LARGESCALE STRUCTURE OF UNIVERSE;
 SURVEYS;
 Astrophysics
 EPrint:
 22 pages, latex, 4 figures. To appear in Astrophysical Journal. Replaced paper contains a revised value for the the spatial correlation function amplitude (r_0)