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Polarization with a Three-dimensional Mixed Magnetic Field and Its Application to GRB 170817A
Lan, Mi-Xiang1; Geng, Jin-Jun2,3; Wu, Xue-Feng1,4; Dai, Zi-Gao2,3
2019-01-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume870Issue:2Pages:10
Corresponding AuthorLan, Mi-Xiang(mxlan@pmo.ac.cn)
AbstractA large-scale ordered magnetic field plays a very important role in the formation and acceleration of a gamma-ray burst (GRB) jet. During the GRB prompt phase, some dissipation processes may occur and disturb the magnetic field, making the field become random to some extent. Therefore, a mixed magnetic field consisting of an ordered component and a random component is plausible for the early afterglow phase. Here we investigate the polarization evolution and light curve of an afterglow under such a three-dimensional mixed magnetic field. Three kinds of ordered component (i.e., aligned, toroidal, and radial) are discussed. We find that the three cases are distinguishable through jet polarization evolution. The polarization angle for a 3D mixed magnetic field with an aligned ordered component can evolve gradually but only changes abruptly by 90 degrees in the toroidal and radial cases. Furthermore, during the reverse shock crossing time, the polarization degree (PD) can be non-zero for the toroidal case but roughly zero for the radial case. Since an aligned component in a jet corresponds to a magnetar central engine and a toroidal component corresponds to a black hole, GRB central engines are distinguishable through polarization observations even if the magnetic field is mixed in a jet. In addition, our polarization calculation can be applied to GRB 170817A associated with GW170817. Using the recently observed PD upper limit 12% of GRB 170817A at t = 244 days, the magnetic field strength ratio of the ordered to random components in this afterglow is constrained to be less than or similar to 0.9.
Keywordgamma-ray burst: general magnetic fields polarization radiation mechanisms: nonthermal shock waves
DOI10.3847/1538-4357/aaf41d
WOS KeywordGAMMA-RAY BURSTS ; LINEAR-POLARIZATION ; OPTICAL AFTERGLOWS ; ENERGY INJECTION ; CENTRAL ENGINE ; JETS ; EMISSION ; EVOLUTION ; GW170817 ; PULSARS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000455931200001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/19960
Collection中国科学院紫金山天文台
Corresponding AuthorLan, Mi-Xiang
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China
3.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing, Jiangsu, Peoples R China
4.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Lan, Mi-Xiang,Geng, Jin-Jun,Wu, Xue-Feng,et al. Polarization with a Three-dimensional Mixed Magnetic Field and Its Application to GRB 170817A[J]. ASTROPHYSICAL JOURNAL,2019,870(2):10.
APA Lan, Mi-Xiang,Geng, Jin-Jun,Wu, Xue-Feng,&Dai, Zi-Gao.(2019).Polarization with a Three-dimensional Mixed Magnetic Field and Its Application to GRB 170817A.ASTROPHYSICAL JOURNAL,870(2),10.
MLA Lan, Mi-Xiang,et al."Polarization with a Three-dimensional Mixed Magnetic Field and Its Application to GRB 170817A".ASTROPHYSICAL JOURNAL 870.2(2019):10.
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