X-RAY SCATTERED HALO AROUND IGR J17544-2619

CORC > 高能物理研究所 > 中国科学院高能物理研究所 > 粒子天体物理中心

	X-RAY SCATTERED HALO AROUND IGR J17544-2619
	Mao, JJ; Ling, ZX; 张双南;Zhang, SN
刊名	ASTROPHYSICAL JOURNAL
	2014
卷号	785 期号:1 页码:23
关键词	X-rays COLFAML binaries X-rays COLFAML individual (IGR J17544-2619) X-rays COLFAML ISM
英文摘要	X-ray photons coming from an X-ray point source not only arrive at the detector directly, but also can be strongly forward-scattered by the interstellar dust along the line of sight (LOS), leading to a detectable diffuse halo around the X-ray point source. The geometry of small-angle X-ray scattering is straightforward, namely, the scattered photons travel longer paths and thus arrive later than the unscattered ones; thus, the delay time of X-ray scattered halo photons can reveal information of the distances of the interstellar dust and the point source. Here we present a study of the X-ray scattered halo around IGR J17544-2619, which is one of the so-called supergiant fast X-ray transients. IGR J17544-2619 underwent a striking outburst when observed with Chandra on 2004 July 3, providing a near delta-function light curve. We find that the X-ray scattered halo around IGR J17544-2619 is produced by two interstellar dust clouds along the LOS. The one that is closer to the observer gives the X-ray scattered halo at larger observational angles, whereas the farther one, which is in the vicinity of the point source, explains the halo with a smaller angular size. By comparing the observational angle of the scattered halo photons with that predicted by different dust grain models, we are able to determine the normalized dust distance. With the delay times of the scattered halo photons, we can determine the point source distance, given a dust grain model. Alternatively, we can discriminate between the dust grain models, if the point source distance is known independently.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000335639300023
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224843]
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	Mao, JJ,Ling, ZX,张双南；Zhang, SN. X-RAY SCATTERED HALO AROUND IGR J17544-2619[J]. ASTROPHYSICAL JOURNAL,2014,785(1):23.
APA	Mao, JJ,Ling, ZX,&张双南；Zhang, SN.(2014).X-RAY SCATTERED HALO AROUND IGR J17544-2619.ASTROPHYSICAL JOURNAL,785(1),23.
MLA	Mao, JJ,et al."X-RAY SCATTERED HALO AROUND IGR J17544-2619".ASTROPHYSICAL JOURNAL 785.1(2014):23.