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 Xu6; An Tao1; Wang JunYi6; Lin JiMing6; Xie MingJie6; Xu HaiGuang3; Hong XiaoYu1; Frey Sandor5 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 12期号:12页码:1597 |
| 关键词 | MASS BLACK-HOLES TIME-SERIES GALAXIES VARIABILITY NGC-5408 M82 methods: statistical galaxies: individual (NGC 5408) stars: oscillations |
| ISSN号 | 1674-4527 |
| 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. |
| 资助项目 | [National Natural Science Foundation of China] ; [National Basic Research Program of China (973 Program)] ; [Strategic Priority Research Program of the CAS] ; [China-Hungary Exchange Program of the CAS] ; [Hungarian Scientific Research Fund] ; [Science & Technology Commission of Shanghai Municipality] |
| 语种 | 英语 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/61370]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.中国科学院国家天文台 2.中国科学院紫金山天文台 3.上海交通大学 4.湘潭大学 5.FOMI Satellite Geodet Observ, H-1592 Budapest, Hungary 6.上海市地震局 |
| 推荐引用方式 GB/T 7714 | Han Xu,An Tao,Wang JunYi,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. |
| APA | Han Xu.,An Tao.,Wang JunYi.,Lin JiMing.,Xie MingJie.,...&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. |
| 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. |
入库方式： OAI收割
来源：国家天文台
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