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Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations
Geng, Jin-Jun1,2,3; Huang, Yong-Feng1,2; Wu, Xue-Feng4; Song, Li-Ming5,6; Zong, Hong-Shi3
2018-08-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume862Issue:2Pages:8
Abstract

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.

Keywordgamma-ray burst: general polarization radiation mechanisms: non-thermal relativistic processes
DOI10.3847/1538-4357/aacd05
WOS KeywordINTERNAL SHOCK MODEL ; DOUBLE RADIO-SOURCES ; LIGHT CURVES ; LINEAR-POLARIZATION ; MILLISECOND PULSARS ; OPTICAL AFTERGLOWS ; EMISSION MECHANISM ; BURST EMISSION ; ACCRETION DISK ; EVOLUTION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000440304800004
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21668
Collection中国科学院紫金山天文台
Corresponding AuthorGeng, Jin-Jun
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Jiangsu, Peoples R China
3.Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
5.Chinese Acad Sci, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Inst High Energy Phys, Particle Astrophys Div, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Geng, Jin-Jun,Huang, Yong-Feng,Wu, Xue-Feng,et al. Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations[J]. ASTROPHYSICAL JOURNAL,2018,862(2):8.
APA Geng, Jin-Jun,Huang, Yong-Feng,Wu, Xue-Feng,Song, Li-Ming,&Zong, Hong-Shi.(2018).Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations.ASTROPHYSICAL JOURNAL,862(2),8.
MLA Geng, Jin-Jun,et al."Probing Magnetic Fields of GRB X-Ray Flares with Polarization Observations".ASTROPHYSICAL JOURNAL 862.2(2018):8.
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