The Angular Two-Point Correlation Function for the FIRST Radio Survey

Abstract

The FIRST (Faint Images of the Radio Sky at Twenty Centimeters) survey now covers 1550 square degrees of sky where $07^{h}16<\alpha <17^{h}40$ and $28^{\circ }.3<\delta <42^{\circ }$. This yields a catalog of 138,665 sources above the survey threshold of 1 mJy, about one third of which are in double-lobed and multi-component sources. We have used these data to obtain the first high-significance measurement of the two-point angular correlation for a deep radio sample. We find that the correlation function between $0.02^{\circ }$ and $2^{\circ }$ is well fitted by a power law of the form $A{\theta }^{\gamma }$ where $A\approx 3\times 10^{-3}$ and $\gamma \approx -1.1$. On small scales ($\theta <0.2^{\circ }$), double and multi-component 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 cross-correlation of radio sources and Abell clusters is determined. A preliminary approach to inferring spatial information is outlined.

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)

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