The origin of the photospheric emission of GRB 220426A
文献类型：期刊论文
| 作者 | Song, Xin-Ying ; Zhang, Shuang-Nan; Ge, Ming-Yu; Zhang, Shu
|
| 刊名 | Monthly Notices of the Royal Astronomical Society
 |
| 出版日期 | 2022 |
| 卷号 | 517期号:2页码:2088-2102 |
| ISSN号 | 0035-8711 |
| 关键词 | gamma-ray burst: individual radiation mechanisms: thermal radiative transfer scattering Astrophysics - High Energy Astrophysical Phenomena |
| DOI | 10.1093/mnras/stac2764 |
| 文献子类 | Article |
| 英文摘要 | GRB 220426A is a bright gamma-ray burst (GRB) dominated by the photospheric emission. We perform several tests to speculate the origin of this photospheric emission. The dimensionless entropy η is large, which is not usual if we assume that it is a pure hot fireball launched by neutrino-antineutrino annihilation mechanism only. Moreover, the outflow has larger η with lower luminosity L in the first few seconds, so that the trend of time-resolved η - L can not be described as a monotonically positive correlation between η and L. A hybrid outflow with almost completely thermalized Poynting flux could account for the quasi-thermal spectrum as well as large η. More importantly, the existence of magnetic field could affect the proton density and neutron-proton coupling effect, so that it could account for the observed trend of time-resolved η - L. The other origins for the photospheric emission, such as non-dissipative hybrid outflow or magnetic reconnection, are not supported because their radiation efficiencies are low, which is not consistent with non-detection of the afterglow for GRB 220426A. Therefore, we think the hybrid outflow may be the most likely origin. |
| 电子版国际标准刊号 | 1365-2966 |
| 语种 | 英语 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/299897]  |
| 专题 | 高能物理研究所_粒子天体物理中心 硬X射线调制望远镜卫星 |
| 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 | Song, Xin-Ying,Zhang, Shuang-Nan,Ge, Ming-Yu,et al. The origin of the photospheric emission of GRB 220426A[J]. Monthly Notices of the Royal Astronomical Society,2022,517(2):2088-2102. |
| APA | Song, Xin-Ying,Zhang, Shuang-Nan,Ge, Ming-Yu,&Zhang, Shu.(2022).The origin of the photospheric emission of GRB 220426A.Monthly Notices of the Royal Astronomical Society,517(2),2088-2102. |
| MLA | Song, Xin-Ying,et al."The origin of the photospheric emission of GRB 220426A".Monthly Notices of the Royal Astronomical Society 517.2(2022):2088-2102. |
入库方式： OAI收割
来源：高能物理研究所
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