来自长射的逆康普顿辐射的观测
1Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, Huntsville, AL, USA.
Nature
|November 22, 2019
概括
长时间的马射线爆发 (GRB) 显示出一个明显的,强大的三电伏发射元件. 这种与余光相关的辐射由反向康普顿散射解释,
科学领域:
- 天体物理学
- 高能天体物理学
- 马射线天文学
背景情况:
- 长时间的马射线爆发 (GRBs) 源于垂死的大恒星的相对论喷射.
- 在喷气中产生的即时发射 (keV-MeV);后照射 (radio-GeV) 是从喷气与介质的相互作用产生的.
- 余光通常由外部冲击产生的同步辐射解释.
研究的目的:
- 分析17个能量级别的GRB 190114C的多频观测结果.
- 调查最近从GRB 190114C观察到的强烈的teraelectronvolt (TeV) 辐射的起源和性质.
- 为了确定 TeV 排放的条件是否在 GRB 中是常见的.
主要方法:
- 对GRB 190114C的多频观测
- 从5 × 10-6到1012 eV的宽带光谱能量分布 (SED) 的分析.
- 模拟发射机制,包括同步辐射和反向康普顿散射.
主要成果:
- GRB 190114C的宽带SED具有双峰结构.
- 确定了一种与同步子元件相比较的特EV光谱元件.
- 这种TeV成分与后照相相关,并由同步子光子的逆康普顿上升散射解释.
结论:
- 高能电子对同步子光子的逆康普顿散射为观察到的TeV辐射提供了令人满意的解释.
- 这种排放所需的条件是GRB的典型情况.
- 反向康普顿辐射可能是长时间马射线爆发的常见现象.
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