Resolving the hard X-ray background in the Chandra Deep Field South

被引:0
|
作者
Gilli, R [1 ]
Giacconi, R [1 ]
Tozzi, P [1 ]
Rosati, P [1 ]
Hasinger, G [1 ]
Kewley, L [1 ]
Wang, JX [1 ]
Zirm, A [1 ]
Mainieri, V [1 ]
Borgani, S [1 ]
Bergeron, J [1 ]
Gilmozzi, R [1 ]
Schreier, E [1 ]
Koekemoer, A [1 ]
Grogin, N [1 ]
Nonino, M [1 ]
Norman, C [1 ]
机构
[1] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
关键词
D O I
10.1007/10856495_90
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The 1Msec observation of the Chandra Deep Field South (CDFS) has almost entirely resolved into single sources the hard X-ray background as measured by the HEAO-1 A2 experiment. The main population of sources, as determined by the first optical identifications, seems to be constituted by an admixture of type 1 and type 2 AGNs. We will consider the X-ray properties of the sources in the CDFS and test their consistency with the predictions from the AGN synthesis models of the X-ray background. An apparent excess of sources at z < 0.8 is found with respect to the model predictions. The X-ray background flux produced by these sources is also exceeding the predictions, suggesting that the bulk of the XRB is produced closer than expected.
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页码:573 / 579
页数:7
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