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Evolution of hard X-ray spectra along the branches in Circinus X-1
Ding GQ(丁国强); Qu JL(屈进禄); Li TB(李惕碚); Ding, GQ; Qu, JL; Li, TP
2003
发表期刊ASTROPHYSICAL JOURNAL
卷号596期号:2页码:L219-L222
通讯作者Chinese Acad Sci, Inst High Energy Phys, Ctr Particle Astrophys, Beijing 100039, Peoples R China ; Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China ; Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
摘要Using the data from the Proportional Counter Array and the High-Energy X-Ray Timing Experiment on board the Rossi X-Ray Timing Explorer satellite, we investigate the evolution of the 3-200 keV spectra of the peculiar low-mass X-ray binary Circinus X-1 along the branches on its hardness-intensity diagram (HID) from the vertical horizontal branch, through the horizontal horizontal branch and normal branch, to the flaring branch. We detect a power-law hard component in the spectra. It is found that the derived photon indices (Gamma) of the power-law hard component are correlated with the position on the HID. The power-law component dominates the X-ray emission of Cir X-1 in the energy band higher than similar to 20 keV. The fluxes of the power-law component are compared with those of the bremsstrahlung component in the spectra. A possible origin of the power-law hard component is discussed.
文章类型Article
关键词binaries : general stars : individual (Circinus X-1) X-rays : binaries X-rays : general X-rays : individual (Circinus X-1)
学科领域Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
DOI10.1086/379338
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000185916100024
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240262
专题院士
粒子天体物理中心
作者单位中国科学院高能物理研究所
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Ding GQ,Qu JL,Li TB,et al. Evolution of hard X-ray spectra along the branches in Circinus X-1[J]. ASTROPHYSICAL JOURNAL,2003,596(2):L219-L222.
APA 丁国强,屈进禄,李惕碚,Ding, GQ,Qu, JL,&Li, TP.(2003).Evolution of hard X-ray spectra along the branches in Circinus X-1.ASTROPHYSICAL JOURNAL,596(2),L219-L222.
MLA 丁国强,et al."Evolution of hard X-ray spectra along the branches in Circinus X-1".ASTROPHYSICAL JOURNAL 596.2(2003):L219-L222.
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