期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 352, 期 3, 页码 L28-L33出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08142.x
关键词
surveys; galaxies : active; quasars : general; diffuse radiation; X-rays : diffuse background; X-rays : galaxies
Most of the soft and a growing fraction of the harder X-ray background has been resolved into emission from point sources, yet the resolved fraction above 7 keV has only been poorly constrained. We use similar to700 ks of XMM-Newton observations of the Lockman Hole and a photometric approach to estimate the total flux attributable to resolved sources in a number of different energy bands. We find the resolved fraction of the X-ray background to be similar to90 per cent below 2 keV but it decreases rapidly at higher energies with the resolved fraction above similar to7 keV being only similar to50 per cent. The integrated X-ray spectrum from detected sources has a slope of similar to1.75, much softer than the Gamma = 1.4 of the total background spectrum. The unresolved background component has the spectral signature of highly obscured active galactic nuclei.
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