NAOC Open IR
Confirming the 115.5-day periodicity in the X-ray light curve of ULX NGC 5408 X-1
Han Xu1; An Tao2; Wang JunYi1; Lin JiMing1; Xie MingJie1; Xu HaiGuang5; Hong XiaoYu2; Frey Sandor6
2012
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume12Issue:12Pages:1597
AbstractThe 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.
KeywordMASS BLACK-HOLES TIME-SERIES GALAXIES VARIABILITY NGC-5408 M82 methods: statistical galaxies: individual (NGC 5408) stars: oscillations
Language英语
Funding Project[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]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61371
Collection中国科学院国家天文台
Affiliation1.上海市地震局
2.中国科学院国家天文台
3.中国科学院紫金山天文台
4.湘潭大学
5.上海交通大学
6.FOMI Satellite Geodet Observ, H-1592 Budapest, Hungary
Recommended Citation
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.
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