Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 353, Issue 2, Pages 523-528Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08085.x
Keywords
galaxies : active; galaxies : clusters : general; X-ray : galaxies : clusters
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Most old, distant radio galaxies should be extended X-ray sources because of inverse Compton scattering of cosmic microwave background (CMB) photons. Such sources can be an important component in X-ray surveys for high-redshift clusters, because of the increase with redshift of both the CMB energy density and the radio source number density. We estimate a lower limit to the space density of such sources and show that inverse Compton scattered emission may dominate above redshifts of 1 and X-ray luminosities of 10(44) erg s(-1), with a space density of radio galaxies >10(-8) MpC(-3). The X-ray sources may last longer than the radio emission and so need not be associated with what is seen to be a currently active radio galaxy.
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