论文标题
光谱指数 - 频率关系用于调查$γ$ ray爆发的陡峭衰变的起源
Spectral index-flux relation for investigating the origins of steep decay in $γ$-ray bursts
论文作者
论文摘要
$γ$ -Ray爆发（GRB）是短暂的瞬变，释放了大量能量（$ 10^{51} -10^{53} $ ERG）。 GRB被认为源于由巨大恒星死亡或紧凑的二元合并的残留物发射的超相关喷气机所携带的能量的内部耗散。尽管在过去的三十年中已经观察到了数千个GRB，但我们仍然对射流中的辐射的何处和如何产生。在这里，我们通过时间分辨的光谱分析来研究光谱指数和通量之间的关系。这种关系与长期存在的情况不相容，该场景引起了从喷气机的高纬度部分延迟到达光子的到来。虽然无法牢固地排除替代方案，但发射颗粒的绝热冷却是发现的关系的最合理的解释，这表明GRB发射的质子同步源。
$γ$-ray bursts (GRBs) are short-lived transients releasing a large amount of energy ($10^{51}-10^{53} $ erg) in the keV-MeV energy range. GRBs are thought to originate from internal dissipation of the energy carried by ultra-relativistic jets launched by the remnant of a massive star's death or a compact binary coalescence. While thousands of GRBs have been observed over the last thirty years, we still have an incomplete understanding of where and how the radiation is generated in the jet. Here we show a relation between the spectral index and the flux found by investigating the X-ray tails of bright GRB pulses via time-resolved spectral analysis. This relation is incompatible with the long standing scenario which invokes the delayed arrival of photons from high-latitude parts of the jet. While the alternative scenarios cannot be firmly excluded, the adiabatic cooling of the emitting particles is the most plausible explanation for the discovered relation, suggesting a proton-synchrotron origin of the GRB emission.
