The cross spectra of Circinus X-1: Evolution of time lags

	The cross spectra of Circinus X-1: Evolution of time lags
	Qu JL(屈进禄); Yu W(虞文); Li TB(李惕碚); Qu, JL; Yu, W; Li, TP
刊名	ASTROPHYSICAL JOURNAL
	2001
卷号	555 期号:1 页码:7-11
关键词	binaries : general stars : individual (Circinus X-1) X-rays : binaries X-rays : individual (Circinus X-1) X-rays : stars
通讯作者	Qu, JL (reprint author), Chinese Acad Sci, Inst High Energy Phys, High Energy Astrophys Lab, Beijing 100039, Peoples R China.
英文摘要	Earlier work showed that the track in the X-ray hardness-intensity diagram of Cir X-1 corresponds to a Z track in its color-color diagram. In this paper, we study the cross spectrum of Cir X-1 in different regions of the hardness-intensity diagram with RXT E/PCA data. Comparing the light curves of Cir X-1 for the energy band 1.8-5.1 keV with those for 5.1-13.1 keV, we find that Cir X-1 exhibits a hard time lag on the horizontal branch and a soft time lag on both the normal and the flaring branches. This indicates that Cir X-1 is similar to GX 5-1 and Cyg X-2 on the horizontal branch but is different from them on the normal branch. We briefly discuss the mechanism of the time lags in the context of Comptonization models.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000169944500002
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/225460]
专题	高能物理研究所_院士高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Qu JL,Yu W,Li TB,et al. The cross spectra of Circinus X-1: Evolution of time lags[J]. ASTROPHYSICAL JOURNAL,2001,555(1):7-11.
APA	屈进禄,虞文,李惕碚,Qu, JL,Yu, W,&Li, TP.(2001).The cross spectra of Circinus X-1: Evolution of time lags.ASTROPHYSICAL JOURNAL,555(1),7-11.
MLA	屈进禄,et al."The cross spectra of Circinus X-1: Evolution of time lags".ASTROPHYSICAL JOURNAL 555.1(2001):7-11.