Polarization with a Three-dimensional Mixed Magnetic Field and Its Application to GRB 170817A
文献类型：期刊论文
| 作者 | Lan, Mi-Xiang1; Geng, Jin-Jun2,3; Wu, Xue-Feng1,4 ; Dai, Zi-Gao2,3
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-01-10 |
| 卷号 | 870期号:2页码:10 |
| 关键词 | gamma-ray burst: general magnetic fields polarization radiation mechanisms: nonthermal shock waves |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aaf41d |
| 通讯作者 | Lan, Mi-Xiang(mxlan@pmo.ac.cn) |
| 英文摘要 | A 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. |
| WOS关键词 | GAMMA-RAY BURSTS ; LINEAR-POLARIZATION ; OPTICAL AFTERGLOWS ; ENERGY INJECTION ; CENTRAL ENGINE ; JETS ; EMISSION ; EVOLUTION ; GW170817 ; PULSARS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000455931200001 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/19959]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Lan, Mi-Xiang |
| 作者单位 | 1.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 |
| 推荐引用方式 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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来源：紫金山天文台
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