Swift Observations of SMC X-3 during Its 2016-2017 Super-Eddington Outburst

doi:10.3847/1538-4357/aa76ec

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	Swift Observations of SMC X-3 during Its 2016-2017 Super-Eddington Outburst
	Weng, SS; Ge MY(葛明玉); Ge, MY; Zhao, HH; Wang, W; Zhang, SN; Bian, WH; Yuan, QR; Zhang SN(张双南)
刊名	ASTROPHYSICAL JOURNAL
	2017
卷号	843 期号:1 页码:69
关键词	accretion, accretion disks pulsars: general stars: neutron X-rays: binaries X-rays: individual (SMC X-3)
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa76ec
文献子类	Article
英文摘要	The Be X-ray pulsar SMC X-3 underwent a giant outburst from 2016 August to 2017 March, which was monitored with the Swift satellite. During the outburst, its broadband flux increased dramatically, and the unabsorbed X-ray luminosity reached an extreme value of similar to 10(39) erg s(-1) around August 24. Using the Swift/XRT data, we measured the observed pulse frequency of the neutron star to compute the orbital parameters of the binary system. After applying the orbital corrections to Swift observations, we found that the spin frequency increased steadily from 128.02 mHz on August 10 and approached the spin equilibrium of similar to 128.74 mHz in 2017 January with an unabsorbed luminosity of L-X similar to 2 x 10(37) erg s(-1), indicating a strong dipolar magnetic field of B similar to 6.8 x 10(12) G at the neutron star surface. The spin-up rate is tightly correlated with its X-ray luminosity during the super-Eddington outburst. The pulse profile in the Swift/XRT data is variable, showing double peaks at the early stage of outburst and then merging into a single peak at low luminosity. Additionally, we report that a low-temperature (kT similar to 0.2 keV) thermal component emerges in the phase-averaged spectra as the flux decays, and it may be produced from the outer truncated disk or the boundary layer between the exterior flow and the magnetosphere.
电子版国际标准刊号	1538-4357
WOS关键词	SMALL-MAGELLANIC-CLOUD ; X-RAY BINARIES ; MAGNETIZED NEUTRON-STARS ; NUSTAR J095551+6940.8 ; ACCRETION LUMINOSITY ; ECLIPSING BINARIES ; GIANT OUTBURST ; MILKY-WAY ; PULSARS ; EVOLUTION
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000404847500005
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284711]
专题	高能物理研究所_粒子天体物理中心高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Weng, SS,Ge MY,Ge, MY,et al. Swift Observations of SMC X-3 during Its 2016-2017 Super-Eddington Outburst[J]. ASTROPHYSICAL JOURNAL,2017,843(1):69.
APA	Weng, SS.,葛明玉.,Ge, MY.,Zhao, HH.,Wang, W.,...&张双南.(2017).Swift Observations of SMC X-3 during Its 2016-2017 Super-Eddington Outburst.ASTROPHYSICAL JOURNAL,843(1),69.
MLA	Weng, SS,et al."Swift Observations of SMC X-3 during Its 2016-2017 Super-Eddington Outburst".ASTROPHYSICAL JOURNAL 843.1(2017):69.