Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1
文献类型：期刊论文
| 作者 | Liu, Ji-Feng1 ; Bregman, Joel N.2; Bai, Yu1; Justham, Stephen1; Crowther, Paul3
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| 刊名 | NATURE
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| 出版日期 | 2013-11-28 |
| 卷号 | 503期号:7477页码:500-+ |
| 英文摘要 | There are two proposed explanations for ultraluminous X-ray sources(1,2) (ULXs) with luminosities in excess of 10(39) erg s(-1). They could be intermediate-mass black holes (more than 100-1,000 solar masses, M-circle dot) radiating at sub-maximal (sub-Eddington) rates, as in Galactic black-hole X-ray binaries but with larger, cooler accretion disks(3-5). Alternatively, they could be stellar-mass black holes radiating at Eddington or super-Eddington rates(2,6). On its discovery, M 101 ULX-1(4,7) had a luminosity of 3 x 10(39) erg s(-1) and a supersoft thermal disk spectrum with an exceptionally low temperature-uncomplicated by photons energized by a corona of hot electrons-more consistent with the expected appearance of an accreting intermediate-mass black hole(3,4). Here we report optical spectroscopic monitoring of M 101 ULX-1. We confirm the previous suggestion(8) that the system contains a Wolf-Rayet star, and reveal that the orbital period is 8.2 days. The black hole has a minimum mass of 5 M-circle dot, and more probably a mass of 20 M-circle dot-30 M-circle dot, but we argue that it is very unlikely to be an intermediate-mass black hole. Therefore, its exceptionally soft spectra at high Eddington ratios violate the expectations for accretion onto stellar-mass black holes(9-11). Accretion must occur from captured stellar wind, which has hitherto been thought to be so inefficient that it could not power an ultraluminous source(12,13). |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000327464200037 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6048]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Univ Michigan, Dept Astron, Ann Arbor, MI 48105 USA 3.Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England |
| 推荐引用方式 GB/T 7714 | Liu, Ji-Feng,Bregman, Joel N.,Bai, Yu,et al. Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1[J]. NATURE,2013,503(7477):500-+. |
| APA | Liu, Ji-Feng,Bregman, Joel N.,Bai, Yu,Justham, Stephen,&Crowther, Paul.(2013).Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1.NATURE,503(7477),500-+. |
| MLA | Liu, Ji-Feng,et al."Puzzling accretion onto a black hole in the ultraluminous X-ray source M 101 ULX-1".NATURE 503.7477(2013):500-+. |
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来源：国家天文台
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