The 2dF galaxy redshift survey: clustering properties of radio galaxies

The clustering properties of local, S1.4GHz ≥ 1 mJy, radio sources are investigated for a sample of 820 objects drawn from the joint use of the FIRST and 2dF Galaxy Redshift surveys. To this aim, we present 271 new bJ ≤ 19.45 spectroscopic counterparts of FIRST radio sources to be added to those already introduced in Magliocchetti et al. (2002). The two-point correlation function for the local radio population is found to be entirely consistent with estimates obtained for the whole sample of 2dFGRS galaxies. From measurements of the redshift-space correlation function �(s) we derive a redshift-space clustering length s0 = 10.7 +0.8 0.7 Mpc, while from the projected correlation function �(rT) we estimate the parameters of the real-space correlation function �(r) = (r/r0) , r0 = 6.7 +0.9 1.1 Mpc and = 1.6±0.1, where h = 0.7 is assumed. Different results are instead obtained if we only consider sources that present signatures of AGN activity in their spectra. These objects are shown to be very strongly correlated,