一个明亮的γ射线耀斑被解释为NGC 253中的巨型磁星耀斑
D Svinkin1, D Frederiks2, K Hurley3
1Ioffe Institute, St Petersburg, Russia. svinkin@mail.ioffe.ru.
Nature
|January 14, 2021
概括
从磁星,高度磁化的中子星, 产生强大的X射线和马射线的爆发. 研究人员观察到GRB 200415A,确定它是NGC 253星系中的磁星.
科学领域:
- 天体物理学
- 高能天体物理学
- 中子星物理学
背景情况:
- 软玛射线反射器 (SGR) 呈现出硬X射线和软玛射线的爆发发射,这归因于具有超强磁场的磁星中子星.
- 巨大的耀斑,来自磁星的能量事件, 能量在1044到1046erg之间.
- 一些巨型耀斑与短玛射线爆发 (GRBs) 有共同的特征,它们与中子星的合并有关.
研究的目的:
- 分析马射线爆发GRB 200415A并确定它的起源.
- 调查巨型耀斑和马射线爆发之间的关系.
- 为了描述磁星的能量排放.
主要方法:
- GRB 200415A的定位在恒星星系NGC 253的一个特定区域.
- 分析GRB 200415A事件的光谱和时间特性.
- 将GRB 200415A的能量输出与已知的磁星巨型耀斑进行比较.
主要成果:
- GRB 200415A被定位在距离地球大约350万帕塞克的NGC 253中.
- 爆发显示了尖的,毫秒级硬光谱,随后在0.2秒内变软.
- GRB 200415A释放的能量 (约. 1.3 × 10^46 erg) 相当于来自银河磁星的超级耀斑.
结论:
- GRB 200415A被确定为来自NGC 253内的磁星的巨大耀斑.
- 这种观测加强了磁星巨型耀斑与某些马射线爆发之间的联系.
- 这项研究为解释这些极端天体物理事件的磁星模型提供了进一步的证据.
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