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The 2013-2014 outburst of xte j1908+094 observed with swift and nustar: spectral evolution and black hole spin constraint

文献类型:期刊论文

作者Zhang, Liang1; Chen, Li1; Qu, Jin-lu2; Bu, Qing-cui1; Zhang, Wei1
刊名Astrophysical journal
出版日期2015-11-10
卷号813期号:2页码:13
ISSN号0004-637X
关键词Accretion, accretion disks Black hole physics Stars: individual (xte j1908+094) X-rays: binaries
DOI10.1088/0004-637x/813/2/90
通讯作者Zhang, liang(201431160006@mail.bnu.edu.cn)
英文摘要We present a spectral study of the black hole candidate xte j1908+094 during its 2013-2014 outburst. we analyzed 36 swift/xrt observations together with a nustar observation taken along this period. the outburst evolution is similar to what is previously observed in other black hole transients. the source transited from an initial low/hard state to a high/soft state and then went back to the low/hard state. the low/hard-state spectra are dominated by a hard component, while the high/soft-state spectra are dominated by a soft component. in the high/soft state, we find that the disk bolometric luminosity deviates weakly from the standard t-in(4) dependence, exhibiting a flatter dependence as l-disk proportional to t-in(2). the radial temperature profile is found to be flatter than that of the standard accretion disk. these results suggest an advection-dominated slim disk. during the nustar observation, the source was in the high/soft state. a flare is seen in the nustar light curves. during the flare, a spectral softening occurs with an increase in power-law flux. we suggest. that the flare may be associated with the relativistic jets. a broad fe k alpha line and a disk reflection component are observed in the spectra, providing an opportunity to measure the black hole spin via the fe-line method. we have fitted the nustar spectra with different relativistically blurred disk reflection models. however, the data do not allow us to constrain the spin of the black hole.
WOS关键词X-RAY REFLECTION ; ACCRETION DISKS ; OBSERVATIONAL EVIDENCE ; EMISSION-LINES ; CYGNUS X-1 ; BINARIES ; STATES ; DISCS ; BEHAVIOR ; CANDIDATES
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000365288900010
URI标识http://www.irgrid.ac.cn/handle/1471x/2176452
专题高能物理研究所
通讯作者Zhang, Liang
作者单位1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
2.Chinese Acad Sci, Lab Particle Astrophys, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Zhang, Liang,Chen, Li,Qu, Jin-lu,et al. The 2013-2014 outburst of xte j1908+094 observed with swift and nustar: spectral evolution and black hole spin constraint[J]. Astrophysical journal,2015,813(2):13.
APA Zhang, Liang,Chen, Li,Qu, Jin-lu,Bu, Qing-cui,&Zhang, Wei.(2015).The 2013-2014 outburst of xte j1908+094 observed with swift and nustar: spectral evolution and black hole spin constraint.Astrophysical journal,813(2),13.
MLA Zhang, Liang,et al."The 2013-2014 outburst of xte j1908+094 observed with swift and nustar: spectral evolution and black hole spin constraint".Astrophysical journal 813.2(2015):13.

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