Extended X-ray emission at high redshifts: radio galaxies versus clusters

被引：29

作者：

Celotti, A

Fabian, AC

机构：

[1] SISSA, I-34014 Trieste, Italy

[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2004年 / 353卷 / 02期

关键词：

galaxies : active; galaxies : clusters : general; X-ray : galaxies : clusters;

D O I：

10.1111/j.1365-2966.2004.08085.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

收藏

页码：523 / 528

页数：6

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