The missing x-ray background

被引：9
作者：
Comastri, A [1 ]
机构：
[1] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy
来源：
MULTIWAVELENGTH AGN SURVEYS | 2004年
关键词：
D O I：
10.1142/9789812702432_0079
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The fraction of the hard X-ray background (XRB) resolved into individual sources by the deep Chandra and XMM-Newton surveys strongly depends on the adopted energy range and decreases with increasing energy. As a consequence the nature of the sources of the even harder (> 10 keV) XRB remains observationally poorly constrained. I will briefly discuss the need for X-ray observations above 10 keV.
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页码：323 / 328
页数：6
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