X-RAY SCATTERED HALO AROUND IGR J17544-2619
文献类型：期刊论文
| 作者 | Mao, Junjie1,2; Ling, Zhixing1 ; Zhang, Shuang-Nan1,3,4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2014-04-10 |
| 卷号 | 785期号:1 |
| 关键词 | X-rays COLFAML X-rays COLFAML X-rays COLFAML binaries individual (IGR J17544-2619) 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000335639300023 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6482]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China 4.Univ Alabama, Dept Phys, Huntsville, AL 35899 USA |
| 推荐引用方式 GB/T 7714 | Mao, Junjie,Ling, Zhixing,Zhang, Shuang-Nan. X-RAY SCATTERED HALO AROUND IGR J17544-2619[J]. ASTROPHYSICAL JOURNAL,2014,785(1). |
| APA | Mao, Junjie,Ling, Zhixing,&Zhang, Shuang-Nan.(2014).X-RAY SCATTERED HALO AROUND IGR J17544-2619.ASTROPHYSICAL JOURNAL,785(1). |
| MLA | Mao, Junjie,et al."X-RAY SCATTERED HALO AROUND IGR J17544-2619".ASTROPHYSICAL JOURNAL 785.1(2014). |
入库方式： OAI收割
来源：国家天文台
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