Evolution of hard X-ray spectra along the orbital phase in circinus X-1
Ding, GQ; Zhang SN(张双南); Li TB(李惕碚); Qu JL(屈进禄); Zhang, SN; Li, TP; Qu, JL
刊名ASTROPHYSICAL JOURNAL
2006
卷号645期号:1页码:576-588
关键词binaries : general stars : individual (Circinus X-1) X-rays : binaries X-rays : general X-rays : individual (Circinus X-1)
学科分类Astronomy & Astrophysics
DOI10.1086/504308
通讯作者Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China ; Tsing Hua Univ, Ctr Astrophys, Beijing 100084, Peoples R China ; Univ Alabama, Dept Phys, Huntsville, AL 35899 USA ; NASA, George C Marshall Space Flight Ctr, Space Sci Lab, Huntsville, AL 35812 USA ; Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
文章类型Article
英文摘要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 spectrum of the peculiar low-mass X-ray binary Circinus X-1 along its orbital phase. A power-law hard component, dominating above similar to 30 keVas well as contributing between 0.9% and 3.5% of the total flux, and the iron emission line are detected in the spectrum. It is found that the derived photon index (Gamma) of the power-law hard component and the characteristics of the iron emission line are modulated by the orbital phase: the hardest hard tail, the lowest line energy, and the largest line width of the iron emission line are detected at the periastron. However, the softest hard tail, the highest line energy, and the lowest line width of the iron emission line are detected after the apastron. At the periastron the source evolves along a complete track in the color-color diagram. These behaviors of orbital modulation are discussed. A possible origin of the power-law hard component is also discussed.
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS记录号WOS:000238832900047
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被引频次:7[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/311005/238006
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
中国科学院高能物理研究所_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,Zhang SN,Li TB,et al. Evolution of hard X-ray spectra along the orbital phase in circinus X-1[J]. ASTROPHYSICAL JOURNAL,2006,645(1):576-588.
APA Ding, GQ.,张双南.,李惕碚.,屈进禄.,Zhang, SN.,...&Qu, JL.(2006).Evolution of hard X-ray spectra along the orbital phase in circinus X-1.ASTROPHYSICAL JOURNAL,645(1),576-588.
MLA Ding, GQ,et al."Evolution of hard X-ray spectra along the orbital phase in circinus X-1".ASTROPHYSICAL JOURNAL 645.1(2006):576-588.
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