IHEP OpenIR
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
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
EISSN1538-4357
Volume763Issue:1Pages:34
AbstractWe 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.
Keywordaccretion, accretion disks binaries: close X-rays: binaries X-rays: individual (CygX-3) stars: winds, outflows
Subject AreaAstronomy & Astrophysics
DOI10.1088/0004-637X/763/1/34
Indexed BySCI ; INSPIREHEP ; ADS
Language英语
WOS IDWOS:000313456700034
ADS Bibcode2013ApJ...763...34W
ADS URLhttps://ui.adsabs.harvard.edu/abs/2013ApJ...763...34W
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2013ApJ...763...34W/citations
inspireid1210549
inspireURLhttps://inspirehep.net/literature/1210549
Citation statistics
Cited Times:3 [INSPIRE]
Cited Times:5 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/224395
Collection中国科学院高能物理研究所
Recommended Citation
GB/T 7714
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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