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Evolution of cross-correlation and time lag of Cyg X-2 along the branches
Lei YJ(雷亚娟); Qu JL(屈进禄); Song LM(宋黎明); Zhang CM(张承模); Zhang S(张澍); Zhang F(张帆); Wang JM(王建民); Li ZB(李志兵); Lei, YJ; Qu, JL; Song, LM; Zhang, CM; Zhang, S; Zhang, F; Wang, JM; Li, ZB; Zhang, GB
2008
发表期刊ASTROPHYSICAL JOURNAL
卷号677期号:1页码:461-472
通讯作者[Lei, Y. J. ; Qu, J. L. ; Song, L. M. ; Zhang, C. M. ; Zhang, S. ; Zhang, F. ; Wang, J. M. ; Li, Z. B.] Chinese Acad Sci, Inst High Energy Phys, Ctr Particle Astrophys, Beijing 100049, Peoples R China ; [Zhang, C. M.] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China ; [Zhang, G. B.] Binhai Coll, Qingdao 266555, Shandong, Peoples R China
摘要We report the detections of the anticorrelated soft and hard X-rays, and the time lags of similar to hectosecond from the neutron star low-mass X-ray binary Cyg X-2, a well-known Z-type luminous source. Both anticorrelation and the positive correlation were detected during the low-intensity states, while only the latter showed up during high-intensity states. Comparing with the lower part of normal branch and flaring branch, we find that more observations located on the horizontal and the upper normal branches are accompanied with anticorrelation, implying the occurrence of the anticorrelation when there is a low mass accretion rate. So far anticorrelated hard lags of 1000 s timescale are only reported from Galactic black hole candidates in their hard states. Here we provide the first evidence that a similar feature can also be established in neutron star systems such as Cyg X-2. Finally, the possible origins of the observed time lags are discussed under current LMXB models.
文章类型Article
关键词accretion, accretion disks binaries : close stars : individual (Cygnus X-2) X-rays : binaries
学科领域Astronomy & Astrophysics
DOI10.1086/533423
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000254754300035
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被引频次:13[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/311005/237575
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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Lei YJ,Qu JL,Song LM,et al. Evolution of cross-correlation and time lag of Cyg X-2 along the branches[J]. ASTROPHYSICAL JOURNAL,2008,677(1):461-472.
APA 雷亚娟.,屈进禄.,宋黎明.,张承模.,张澍.,...&Zhang, GB.(2008).Evolution of cross-correlation and time lag of Cyg X-2 along the branches.ASTROPHYSICAL JOURNAL,677(1),461-472.
MLA 雷亚娟,et al."Evolution of cross-correlation and time lag of Cyg X-2 along the branches".ASTROPHYSICAL JOURNAL 677.1(2008):461-472.
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