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The orbital phase resolved spectroscopy of X-ray binary 4U 1822-371 with Suzaku
Niu, Shu1; Yan, Shu-Ping1; Lei, Shi-Jun1; Nowak, Michael A.2; Schulz, Norbert S.2; Ji, Li1
Abstract4U 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.
KeywordAccretion, Accretion Disks Binaries: Eclipsing Line: Formation Binaries: Spectroscopic X-rays: Binaries
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000375006700005
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
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).
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