Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1 | |
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 |
2012-12-01 | |
卷号 | 12期号:12页码:1597-1602 |
关键词 | methods: statistical galaxies: individual (NGC 5408) stars: oscillations |
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 |
内容类型 | 期刊论文 |
源URL | [http://119.78.226.72/handle/331011/18105] |
专题 | 上海天文台_VLBI研究室 |
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. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论