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 |
DOI | 10.1088/0004-637x/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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来源:高能物理研究所
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