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 10^44 erg/s, 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.
Titolo: | Extended X-ray emission at high redshifts: radio galaxies vs clusters |
Autori: | Celotti, Anna Lisa; Fabian, A. C. |
Rivista: | |
Data di pubblicazione: | 2004 |
Volume: | 353 |
Fascicolo: | 2 |
Pagina iniziale: | 523 |
Pagina finale: | 528 |
Digital Object Identifier (DOI): | 10.1111/j.1365-2966.2004.08085.x |
URL: | https://doi.org/10.1111/j.1365-2966.2004.08085.x https://arxiv.org/abs/astro-ph/0405622 |
Appare nelle tipologie: | 1.1 Journal article |
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