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题名: The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku
作者: Niu, Shu1; Yan, Shu-Ping1; Lei ShiJun(雷仕俊)1; Nowak, Michael A.2; Schulz, Norbert S.2; Ji Li(纪丽)1
刊名: RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期: 2016-04-01
卷号: 16, 期号:4
关键词: accretion, accretion disks ; binaries: eclipsing ; line: formation ; binaries: spectroscopic ; X-rays: binaries
DOI: 10.1088/1674-4527/16/4/057
文章类型: Article
英文摘要: 4U 1822-371 is a typical edge-on eclipsing low mass X-ray binary and the prototype of accretion disk coronal sources. We report on the results of a spectral analysis over the energy range 0.5-45 keV observed by Suzaku in 2006. We extract spectra from five orbital phases. The spectra can be equally well described by various previously proposed models: an optically thick model described by a partially covered cutoff power law and an optically thin model described by a blackbody plus a cutoff power law. The optically thick model requires a covering fraction of about 55%, while the optically thin model requires a temperature of the central source of about 0.16 keV. The spectrum in the optically thick model also shows the previously detected cyclotron line feature at similar to 30 keV with the same Suzaku observation. This feature confirms the presence of a strong magnetic field. The Fe K-alpha fluorescent line strengths as well as the detected Fe XXVI strengths are similar to previous Chandra and XMM-Newton detections in our phased spectral analysis; however, we also observe strong Fe XXVI during the eclipse, which indicates a slightly larger central corona.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: ACCRETION DISK ; MODULATION ; X1822-371
收录类别: SCI
项目资助者: National Natural Science Foundation of China(11273062) ; 100 talents program of the Chinese Academy of Sciences
语种: 英语
WOS记录号: WOS:000375006700005
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16207
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA
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