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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; Han,X
2012-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN1674-4527
Volume12Issue:12Pages:1597-1602
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.
KeywordMethods: Statistical Galaxies: Individual (Ngc 5408) Stars: Oscillations
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/1674-4527/12/12/001
WOS KeywordMASS BLACK-HOLES ; TIME-SERIES ; GALAXIES ; VARIABILITY ; NGC-5408 ; M82
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000313011000001
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10097
Collection期刊(老文献)
Corresponding AuthorHan,X
Affiliation1.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
Recommended Citation
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.,...&Han,X.(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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