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

	X-ray softening during the 2008 outburst of XTE J1810-189
	Weng, Shan-Shan 1,2,3; Zhang, Shuang-Nan 2,4; Yi, Shu-Xu 2; Rong, Yu 2; Gao, Xu-Dong 4,5
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-07-01
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)
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).
收录类别	SCI
语种	英语
WOS记录号	WOS:000356339300051
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5677]
专题	国家天文台_空间科学研究部
作者单位	1.Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey 2.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 3.Xiangtan Univ, Dept Phys, Xiangtan 411105, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 5.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Weng, Shan-Shan,Zhang, Shuang-Nan,Yi, Shu-Xu,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	Weng, Shan-Shan,Zhang, Shuang-Nan,Yi, Shu-Xu,Rong, Yu,&Gao, Xu-Dong.(2015).X-ray softening during the 2008 outburst of XTE J1810-189.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,450(3),2915-2921.
MLA	Weng, Shan-Shan,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.