Extended X-ray emission at high redshifts: radio galaxies versus clusters
نویسنده
چکیده
Most old distant radio galaxies should be extended X–ray sources due to inverse Compton scattering of Cosmic Microwave Background (CMB) photons. Such sources can be an important component in X-ray surveys for high redshift clusters, due to 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 one and X-ray luminosities of 10erg s, with a space density of radio galaxies > 10 Mpc. 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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