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
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2015
卷号447期号:1页码:486-491
关键词accretion, accretion discs black hole physics X-rays: binaries X-rays: individual: Swift J1357.2-0933 X-rays: stars
学科分类Astronomy & Astrophysics
DOI10.1093/mnras/stu2610
通讯作者翁山杉
文章类型Article
英文摘要Swift 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.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000350272700038
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228266
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
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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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