Unconventional AGN in hard X-ray surveys

被引：22
|
作者：
Comastri, A
Brusa, M
Mignoli, M
机构：
[1] INAF, Osservatorio Astron Bologna, I-40127 Bologna, Italy
[2] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy
来源：
ASTRONOMISCHE NACHRICHTEN | 2003年 / 324卷 / 1-2期
关键词：
X-rays; surveys;
D O I：
10.1002/asna.200310008
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Extensive programs of follow-up observations of hard X-ray selected sources have unambiguously revealed that the sources of the X-ray background are characterized by an extremely large dispersion in their optical magnitude and spectroscopic classification. Here we present the results of an attempt to understand the nature of the observed variety using a simple prescription for their optical to X-ray energy distribution.
引用
收藏
页码：28 / 31
页数：4
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