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

页码：829 / 833

页数：5

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