The unresolved hard X-ray background:: the missing source population implied by the Chandra and XMM-Newton deep fields

被引：190

作者：

Worsley, MA

Fabian, AC

Bauer, FE

Alexander, DM

Hasinger, G

Mateos, S

Brunner, H

Brandt, WN

Schneider, DP

机构：

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

[2] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany

[3] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain

[4] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2005年 / 357卷 / 04期

关键词：

surveys; galaxies : active; diffuse radiation; X-rays : diffuse background; X-rays : galaxies;

D O I：

10.1111/j.1365-2966.2005.08731.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We extend our earlier work on X-ray source stacking in the deep XMM-Newton observation of the Lockman Hole, to the 2-Ms Chandra Deep Field North (CDF-N) and the 1-Ms Chandra Deep Field South (CDF-S). The XMM-Newton work showed the resolved fraction of the X-ray background (XRB) to be similar to80-100 per cent at less than or similar to2 keV but this decreased to only similar to50 per cent above 8 keV. The CDF-N and CDF-S probe deeper, and are able to fill in some of the missing fraction in the 4-6 keV range, but the resolved fraction in the 6-8 keV band remains only similar to60 per cent, confirming the trend seen with XMM-Newton. The missing XRB component has a spectral shape that is consistent with a population of highly obscured active galactic nuclei (AGN) at redshifts similar to0.5-1.5 and with absorption column densities of similar to10(23)-10(24) cm(-2).

引用

页码：1281 / 1287

页数：7

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