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STATE-DEPENDENT ORBITAL MODULATION OF X-RAYS IN CYG X-3
Weng SS(翁山杉); Zhang SN(张双南); Ge MQ(葛明琪); Li J(李剑); Zhang S(张澍); Weng, SS; Zhang, SN; Ge, MY; Li, J; Zhang, S
2013
发表期刊ASTROPHYSICAL JOURNAL
卷号763期号:1页码:34
摘要We analyze all of the available RXTE observations of Cyg X-3 in order to investigate the connection between the central X-ray source and its surrounding environment. The hardness-intensity diagram of Cyg X-3 displays a "shoe" shape rather than the Q-type shape commonly seen in other black hole X-ray binary, and exhibits no apparent hysteresis effect. During the gamma-ray outbursts, no existing data are located in the hard and intermediate states, which suggest the absence of a significant population of non-thermal electrons when the source is in these states. For the first time, we present the orbital modulation of the X-ray light curve (LC) of all five states. The different energy band LCs are in phase with each other in all five states, and the modulation amplitude of both soft and hard X-ray LCs monotonously increases with decreasing hardness from hard to soft non-thermal states. We confirm that the modulation depth decreases with increasing energy in the hard, intermediate, and very high states, as originally reported by Zdziarski et al. However, in the soft non-thermal state, the hard X-ray modulation strength significantly increases and is even larger than the soft X-ray one. Our results rule out both wind absorption and jet origins of the hard X-ray LC modulation in the soft non-thermal state, and challenge our understanding of the states of Cyg X-3.
关键词accretion, accretion disks binaries: close X-rays: binaries X-rays: individual (CygX-3) stars: winds, outflows
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/763/1/34
收录类别SCI
WOS记录号WOS:000313456700034
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被引频次:2[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/311005/224395
专题粒子天体物理中心
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Weng SS,Zhang SN,Ge MQ,et al. STATE-DEPENDENT ORBITAL MODULATION OF X-RAYS IN CYG X-3[J]. ASTROPHYSICAL JOURNAL,2013,763(1):34.
APA 翁山杉.,张双南.,葛明琪.,李剑.,张澍.,...&Zhang, S.(2013).STATE-DEPENDENT ORBITAL MODULATION OF X-RAYS IN CYG X-3.ASTROPHYSICAL JOURNAL,763(1),34.
MLA 翁山杉,et al."STATE-DEPENDENT ORBITAL MODULATION OF X-RAYS IN CYG X-3".ASTROPHYSICAL JOURNAL 763.1(2013):34.
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