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Multiwavelength light-curve evolution of Swift J1357.2-0933 during its 2011 outburst
Weng SS(翁山杉); Zhang SN(张双南); Weng, SS; Zhang, SN
2015
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
EISSN1365-2966
Volume447Issue:1Pages:486-491
Corresponding Author翁山杉
SubtypeArticle
AbstractSwift J1357.2-0933 underwent an episodic accretion in 2011 and provided very regular temporal and spectral evolution, making it an ideal source for exploring the nature of very faint X-ray transients. In this work, we present a detailed analysis on both X-ray and near-ultraviolet (NUV) light curves. The fluxes at all wavelengths display a near-exponential decays in the early phase and transit to a faster decay at late times. The e-folding decay time-scales monotonically decrease with photon energies, and the derived viscous time-scale is tau((M) over dot) similar to 60 d. The time-scale in the late faster decay stage is about a few days. The high ratio of NUV luminosity to X-ray luminosity indicates that the irradiation is unimportant in this outburst, while the near-exponential decay profile and the long decay time-scales conflict with the disc thermal-viscous instability model. We thus suggest that the disc is thermally stable during the observations. Adopting the truncated disc model, we obtain a lower limit of peak accretion rate of 0.03 (M) over dot(Edd) and the X-ray radiative efficiency eta < 5 x 10(-4), which decreases as the luminosity declines. The low X-ray radiative efficiency is caused by the combined action of advection and outflows, and naturally explains that the X-ray reprocessing is overwhelmed by the viscous radiation of the outer standard disc in the NUV regime. We also propose a possibility that the outer standard disc recedes from the central black hole, resulting in the faster decay at late times.
Keywordaccretion, accretion discs black hole physics X-rays: binaries X-rays: individual: Swift J1357.2-0933 X-rays: stars
Subject AreaAstronomy & Astrophysics
DOI10.1093/mnras/stu2610
Indexed BySCI ; INSPIREHEP ; ADS
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000350272700038
ADS Bibcode2015MNRAS.447..486W
ADS URLhttps://ui.adsabs.harvard.edu/abs/2015MNRAS.447..486W
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2015MNRAS.447..486W/citations
inspireid1406100
inspireURLhttps://inspirehep.net/literature/1406100
Citation statistics
Cited Times:9 [INSPIRE]
Cited Times:11 [ADS]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/228266
Collection粒子天体物理中心
Recommended Citation
GB/T 7714
Weng SS,Zhang SN,Weng, SS,et al. Multiwavelength light-curve evolution of Swift J1357.2-0933 during its 2011 outburst[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,447(1):486-491.
APA 翁山杉,张双南,Weng, SS,&Zhang, SN.(2015).Multiwavelength light-curve evolution of Swift J1357.2-0933 during its 2011 outburst.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,447(1),486-491.
MLA 翁山杉,et al."Multiwavelength light-curve evolution of Swift J1357.2-0933 during its 2011 outburst".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447.1(2015):486-491.
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