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X-RAY SCATTERED HALO AROUND IGR J17544-2619
Mao, JJ; Ling, ZX; 张双南;Zhang, SN
2014
发表期刊ASTROPHYSICAL JOURNAL
卷号785期号:1页码:23
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.
关键词X-rays COLFAML binaries X-rays COLFAML individual (IGR J17544-2619) X-rays COLFAML ISM
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/785/1/23
收录类别SCI
WOS记录号WOS:000335639300023
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被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224843
专题粒子天体物理中心
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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.
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