Temporal and spectral correlations of Cygnus X-1

	Temporal and spectral correlations of Cygnus X-1
	Li TB(李惕碚); Li, TP; Feng, YX; Chen, L
刊名	ASTROPHYSICAL JOURNAL
	1999
卷号	521 期号:2 页码:789-797
关键词	accretion, accretion disks stars : individual (Cygnus X-l) X-rays : stars
通讯作者	Chinese Acad Sci, Inst High Energy Phys, High Energy Astrophys Lab, Beijing, Peoples R China ; Beijing Normal Univ, Dept Astron, Beijing, Peoples R China
英文摘要	Temporal and spectral properties of X-ray rapid variability of Cyg X-l are studied through correlation analysis in the time domain on different timescales. The correlation coefficients between the total intensity in the 2-60 keV band and the hardness ratio of the 13-60 keV to the 2-6 keV band on the timescale of similar to 1 ms are always negative in all states. For soft states, the correlation coefficients are positive on all timescales from similar to 0.01 to similar to 100 s, which is significantly different from those for transition and low states. The temporal structures in the high-energy band are narrower than those in low-energy band in quite a few cases. The delay of high-energy photons relative to low-energy ones in the X-ray variations has also been revealed by the correlation analysis. The implications of the observed temporal and spectral characteristics for the production region and mechanism of Cyg X-l X-ray variations are discussed.
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:000082017800032
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238490]
专题	高能物理研究所_院士高能物理研究所_理论物理室高能物理研究所_多学科研究中心
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 TB,Li, TP,Feng, YX,et al. Temporal and spectral correlations of Cygnus X-1[J]. ASTROPHYSICAL JOURNAL,1999,521(2):789-797.
APA	李惕碚,Li, TP,Feng, YX,&Chen, L.(1999).Temporal and spectral correlations of Cygnus X-1.ASTROPHYSICAL JOURNAL,521(2),789-797.
MLA	李惕碚,et al."Temporal and spectral correlations of Cygnus X-1".ASTROPHYSICAL JOURNAL 521.2(1999):789-797.