Clustering of Radio Sources at High Redshift

We investigate the large-scale clustering of radio sources in the FIRST 1.4-GHz survey by analysing their distribution function. We estimate the angular two-point correlation function w(theta), the variance Psi_2, and skewness Psi_3 of the distribution; both w(theta) and Psi_2 show power-law behaviour with an amplitude corresponding a spatial correlation length of r_0 ~10 h^{-1}Mpc. We detect significant skewness in the distribution, the first such detection in radio surveys, consistent with the non-linear gravitational growth of perturbations from primordial Gaussian initial conditions. We also investigate how different theoretical predictions for the normalised variance sigma^2 can match our measurements.