The XMM-Newton/2dF survey - V. the radio properties of the X-ray population

In this paper, we cross-correlate the FIRST (Faint Images of the Radio Sky at Twenty centimeters) 1.4-GHz radio survey with a wide-field (1.6 deg2) shallow [fX(0.5 − 8 keV) ≈ 10−14 erg  s−1]XMM–Newton survey. We find 12 X-ray/radio matches representing 4 per cent of the X-ray-selected sample. Most of them are found to be associated with active galactic nuclei (a total of nine) on the basis of the ...