X-ray softening during the 2008 outburst of XTE J1810-189

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	X-ray softening during the 2008 outburst of XTE J1810-189
	Weng SS(翁山杉); Zhang SN(张双南); Yi SX(易疏序); Rong Y(容昱); Weng, SS; Zhang, SN; Yi, SX; Rong, Y; Gao, XD
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015
卷号	450 期号:3 页码:2915-2921
关键词	accretion accretion discs stars: distances stars: neutron X-rays: bursts X-rays: individual (XTE J1810-189)
通讯作者	翁山杉 ; 张双南
英文摘要	XTE J1810-189 underwent an outburst in 2008, and was observed over similar to 100 d by RXTE. Performing a time-resolved spectral analysis on the photospheric radius expansion burst detected on 2008 May 4, we obtain the source distance in the range 3.5-8.7 kpc for the first time. During its outburst, XTE J1810-189 did not enter into the high/soft state, and both the soft and hard colours decreased with decreasing flux. The fractional rms remained at high values (similar to 30 per cent). The RXTE/PCA spectra for 3-25 keV can be described by an absorbed power-law component with an additional Gaussian component, and the derived photon index I" increased from 1.84 +/- A 0.01 to 2.25 +/- A 0.04 when the unabsorbed X-ray luminosity at 3-25 keV dropped from 4 x 10(36) to 6 x 10(35) erg s(-1). The relatively high flux, dense observations and broad-band spectra are strong evidence that the softening behaviour detected in the outburst of XTE J1810-189 originates from the evolution of a non-thermal component rather than the thermal component (i.e. neutron star surface emission).
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000356339300051
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228411]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Weng SS,Zhang SN,Yi SX,et al. X-ray softening during the 2008 outburst of XTE J1810-189[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,450(3):2915-2921.
APA	翁山杉.,张双南.,易疏序.,容昱.,Weng, SS.,...&Gao, XD.(2015).X-ray softening during the 2008 outburst of XTE J1810-189.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,450(3),2915-2921.
MLA	翁山杉,et al."X-ray softening during the 2008 outburst of XTE J1810-189".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 450.3(2015):2915-2921.