Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1
文献类型：期刊论文
| 作者 | Han, Xu1; An, Tao2,4; Wang, Jun-Yi1,3; Lin, Ji-Ming1; Xie, Ming-Jie1; Xu, Hai-Guang5; Hong, Xiao-Yu2,4; Frey, Sandor6 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2012-12-01 |
| 卷号 | 12期号:12页码:1597-1602 |
| ISSN号 | 1674-4527 |
| 关键词 | methods: statistical galaxies: individual (NGC 5408) stars: oscillations |
| 通讯作者 | Han,X |
| 英文摘要 | The Swift/XRT light curve of the ultraluminous X-ray source NGC 5408 X-1 was re-analyzed with two new numerical approaches, the Weighted Wavelet Z-transform and CLEANest, and the results are different from previous studies. Both techniques detected a prominent periodicity with a time scale of 115.5 +/- 1.5 days, in excellent agreement with the detection of the same periodicity first reported by Strohmayer. Monte Carlo simulations were employed to test the statisitical confidence of the 115.5-day periodicity, yielding a statistical significance of >99.98% (or > 3.8 sigma). The robust detection of the 115.5-day quasi-periodic oscillations, if they are due to the orbital motion of the binary, would infer a mass of a few thousand M-circle dot for the central black hole, implying there is an intermediate-mass black hole in NGC 5408 X-1. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MASS BLACK-HOLES ; TIME-SERIES ; GALAXIES ; VARIABILITY ; NGC-5408 ; M82 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000313011000001 |
| 公开日期 | 2014-05-15 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10097]  |
| 专题 | 紫金山天文台_期刊（老文献） |
| 作者单位 | 1.Guilin Univ Elect Technol, Minist Educ, Key Lab Cognit Radio & Informat Proc, Guilin 541004, Peoples R China 2.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 3.Xiangtan Univ, Sch Math & Computat Sci, Xiangtan 411105, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 5.Shanghai Jiao Tong Univ, Dept Phys, Shanghai 200240, Peoples R China 6.FOMI Satellite Geodet Observ, H-1592 Budapest, Hungary |
| 推荐引用方式 GB/T 7714 | Han, Xu,An, Tao,Wang, Jun-Yi,et al. Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(12):1597-1602. |
| APA | Han, Xu.,An, Tao.,Wang, Jun-Yi.,Lin, Ji-Ming.,Xie, Ming-Jie.,...&Frey, Sandor.(2012).Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(12),1597-1602. |
| MLA | Han, Xu,et al."Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.12(2012):1597-1602. |
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来源：紫金山天文台
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