LONG-TERM X-RAY MONITORING OF LS I+61 degrees 303: ANALYSIS OF SPECTRAL VARIABILITY AND FLARES

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	LONG-TERM X-RAY MONITORING OF LS I+61 degrees 303: ANALYSIS OF SPECTRAL VARIABILITY AND FLARES
	Li J(李剑); Zhang S(张澍); Chen YP(陈玉鹏); Wang JM(王建民); Li, J; Torres, DF; Zhang, S; Chen, YP; Hadasch, D; Ray, PS
刊名	ASTROPHYSICAL JOURNAL
	2011
卷号	733 期号:2 页码:89
关键词	X-rays: binaries X-rays: individual (LS I+61 degrees 303)
通讯作者	[Li, Jian ; Zhang, Shu ; Chen, Yupeng ; Wang, Jianmin] Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Torres, Diego F.] ICREA, Barcelona 08010, Spain ; [Torres, Diego F. ; Hadasch, Daniela ; Rea, Nanda] Inst Ciencies Espai IEEC CSIC, Barcelona 08193, Spain ; [Ray, Paul S.] USN, Div Space Sci, Res Lab, Washington, DC 20375 USA ; [Kretschmar, Peter] ESA European Space Astron Ctr, Madrid, Spain ; [Wang, Jianmin] Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China
英文摘要	We report on the full analysis of a Rossi X-ray Timing Explorer Proportional Counter Array monitoring of the gamma-ray binary system LS I +61 degrees 303. The data set covers 42 contiguous cycles of the system orbital motion. Analyzing this X-ray monitoring data set, the largest to date for this source, we report on the variability of the orbital profile and the spectral distribution, and provide strong evidence for an anti-correlation between flux and spectral index (the higher the flux, the harder the spectral index). Furthermore, we present the analysis of two newly discovered kilosecond-timescale flares, which present significant variability also on shorter timescales and tend to occur at orbital phases between 0.6 and 0.9. However, a detailed timing analysis of the flares does not show any coherent or quasi-coherent (QPO) structure in their power spectra. We also investigated the possible appearance of the radio super-orbital modulation at X-ray energies, but we could not unambiguously detect such modulation in the system flux history nor in the evolution of its orbital modulation fraction.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
原文出处	SCI
语种	英语
WOS记录号	WOS:000290676100016
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240386]
专题	高能物理研究所_粒子天体物理中心
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	Li J,Zhang S,Chen YP,et al. LONG-TERM X-RAY MONITORING OF LS I+61 degrees 303: ANALYSIS OF SPECTRAL VARIABILITY AND FLARES[J]. ASTROPHYSICAL JOURNAL,2011,733(2):89.
APA	李剑.,张澍.,陈玉鹏.,王建民.,Li, J.,...&Wang, JM.(2011).LONG-TERM X-RAY MONITORING OF LS I+61 degrees 303: ANALYSIS OF SPECTRAL VARIABILITY AND FLARES.ASTROPHYSICAL JOURNAL,733(2),89.
MLA	李剑,et al."LONG-TERM X-RAY MONITORING OF LS I+61 degrees 303: ANALYSIS OF SPECTRAL VARIABILITY AND FLARES".ASTROPHYSICAL JOURNAL 733.2(2011):89.