The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku

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	The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku
	Niu, Shu 1; Yan, Shu-Ping 1; Lei, Shi-Jun1 ; Nowak, Michael A.2; Schulz, Norbert S.2; Ji, Li1
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2016-04-01
卷号	16 期号:4
关键词	accretion, accretion disks binaries: eclipsing line: formation binaries: spectroscopic X-rays: binaries
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
语种	英语
WOS记录号	WOS:000375006700005
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/16207]
专题	紫金山天文台_暗物质和空间天文实验室
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
推荐引用方式 GB/T 7714	Niu, Shu,Yan, Shu-Ping,Lei, Shi-Jun,et al. The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(4).
APA	Niu, Shu,Yan, Shu-Ping,Lei, Shi-Jun,Nowak, Michael A.,Schulz, Norbert S.,&Ji, Li.(2016).The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(4).
MLA	Niu, Shu,et al."The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.4(2016).