Bizarre hard X-ray outbursts of Cygnus X-1

被引：11
|
作者：
Stern, BE [1 ]
Beloborodov, AM
Poutanen, J
机构：
[1] Stockholm Observ, SE-13336 Saltsjobaden, Sweden
[2] Russian Acad Sci, PN Lebedev Phys Inst, Ctr Astro Space, Moscow 117810, Russia
[3] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
来源：
ASTROPHYSICAL JOURNAL | 2001年 / 555卷 / 02期
关键词：
accretion; accretion disks; gamma rays : observations; stars : individual (Cygnus X-1);
D O I：
10.1086/321462
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Very high activity in Cygnus X-1 during 1999 April 19-21 was recorded by the BATSE Large Area Detectors on board the Compton Gamma Ray Observatory. The peak luminosity was an order of magnitude higher than the normal luminosity of Cyg X-1. This fact can be critical for models of the hard state of Cyg X-1. The longest outburst lasted similar to 1000 s and demonstrated very unusual temporal and spectral behavior, which indicates the presence of two emission components. One component is relatively soft (with a cutoff below similar to 100 keV) and highly variable, while the other is hard (extending above 100 keV) with much slower variability.
引用
收藏
页码：829 / 833
页数：5
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