Evolution of cross-correlation and time lag of Cyg X-2 along the branches
文献类型：期刊论文
| 作者 | Lei, Y. J.1; Qu, J. L.1; Song, L. M.1; Zhang, C. M.1,2; Zhang, S.1; Zhang, F.1; Wang, J. M.1; Li, Z. B.1; Zhang, G. B.3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2008-04-10 |
| 卷号 | 677期号:1页码:461-472 |
| 关键词 | accretion, accretion disks binaries : close stars : individual (Cygnus X-2) X-rays : binaries |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000254754300035 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7463]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Inst High Energy Phys, Ctr Particle Astrophys, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Binhai Coll, Qingdao 266555, Shandong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lei, Y. J.,Qu, J. L.,Song, L. M.,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 | Lei, Y. J..,Qu, J. L..,Song, L. M..,Zhang, C. M..,Zhang, S..,...&Zhang, G. B..(2008).Evolution of cross-correlation and time lag of Cyg X-2 along the branches.ASTROPHYSICAL JOURNAL,677(1),461-472. |
| MLA | Lei, Y. J.,et al."Evolution of cross-correlation and time lag of Cyg X-2 along the branches".ASTROPHYSICAL JOURNAL 677.1(2008):461-472. |
入库方式： OAI收割
来源：国家天文台
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