The photospheric origin of the Yonetoku relation in gamma-ray bursts
The photospheric origin of the Yonetoku relation in gamma-ray bursts
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DOI：
10.1038/s41467-019-09281-z
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发表时间：
2018-06
影响因子：
16.6
通讯作者：
Hirotaka Ito;J. Matsumoto;S. Nagataki;D. Warren;M. Barkov;D. Yonetoku
中科院分区：
文献类型：
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作者：
Hirotaka Ito;J. Matsumoto;S. Nagataki;D. Warren;M. Barkov;D. Yonetoku
长时间伽马射线暴（GRB）是自大爆炸以来最明亮的事件，被认为起源于从大质量恒星包层中爆发的超相对论喷流。尽管经过几十年的研究，仍然没有就其排放机制达成共识。一个尚未解决的问题是观测中发现的光谱峰值能量和峰值亮度之间紧密相关的起源。这种Yonetoku关系是发现的伽玛射线暴发射的瞬发相的属性中最紧密的相关性，提供了最好的诊断辐射机制。在这里，我们提出了三维流体动力学模拟，和后处理辐射传输计算，从相对论喷流的光球发射。我们的模拟再现Yonetoku关系作为视角的自然结果。虽然喷流动力学敏感地依赖于光度，但无论如何，相关性都成立。这一结果有力地表明，光球辐射是伽玛暴瞬发相的主要成分。
Long duration gamma-ray bursts (GRBs), the brightest events since the Big Bang itself, are believed to originate in an ultra-relativistic jet breaking out from a massive stellar envelope. Despite decades of study, there is still no consensus on their emission mechanism. One unresolved question is the origin of the tight correlation between the spectral peak energy and peak luminosity discovered in observations. This Yonetoku relation is the tightest correlation found in the properties of the prompt phase of GRB emission, providing the best diagnostic for the radiation mechanism. Here we present three-dimensional hydrodynamical simulations, and post-process radiation transfer calculations, of photospheric emission from a relativistic jet. Our simulations reproduce the Yonetoku relation as a natural consequence of viewing angle. Although jet dynamics depend sensitively on luminosity, the correlation holds regardless. This result strongly suggests that photospheric emission is the dominant component in the prompt phase of GRBs.