Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations
文献类型：期刊论文
| 作者 | Zong, HS; Song, LM ; Wu, XF; Huang, YF; Geng, JJ; Song LM(宋黎明)
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2018 |
| 卷号 | 862期号:2页码:115 |
| ISSN号 | 0004-637X |
| 关键词 | gamma-ray burst: general polarization radiation mechanisms: non-thermal relativistic processes |
| DOI | 10.3847/1538-4357/aacd05 |
| 文献子类 | Article |
| 英文摘要 | X-ray flares, lasting for similar to 100-1000 s in the X-ray band, are often observed following gamma-ray bursts (GRBs). The physical origin of X-ray flares is still unknown merely with the temporal/spectral information. On the other hand, some polarimeters are expected to be launched within several years, thanks to the increasing interest on astronomical X-ray polarimetry. Here, by assuming that X-ray flares are synchrotron radiation from relativistic spherical shells, we show that the linear polarization degree during the rising phase of an X-ray flare is much higher for the emitting region with toroidal magnetic fields than for that with random magnetic fields. In the decay phase of the flare, the evolution of the polarization degree is determined by the curvature effect of the emitting shell, which is a natural feature of jet scenarios for flares. Therefore, the measurement of the polarization of X-ray flares would provide a useful tool to probe the configuration of magnetic fields in the emission region, and may even help to test the curvature effect. The information on the magnetic configuration can further help us to understand the properties of GRB jets. |
| 电子版国际标准刊号 | 1538-4357 |
| WOS关键词 | INTERNAL SHOCK MODEL ; DOUBLE RADIO-SOURCES ; LIGHT CURVES ; LINEAR-POLARIZATION ; MILLISECOND PULSARS ; OPTICAL AFTERGLOWS ; EMISSION MECHANISM ; BURST EMISSION ; ACCRETION DISK ; EVOLUTION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000440304800004 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286163]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 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 | Zong, HS,Song, LM,Wu, XF,et al. Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations[J]. ASTROPHYSICAL JOURNAL,2018,862(2):115. |
| APA | Zong, HS,Song, LM,Wu, XF,Huang, YF,Geng, JJ,&宋黎明.(2018).Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations.ASTROPHYSICAL JOURNAL,862(2),115. |
| MLA | Zong, HS,et al."Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations".ASTROPHYSICAL JOURNAL 862.2(2018):115. |
入库方式： OAI收割
来源：高能物理研究所
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