论文标题
对明亮的Fermi-GBM短伽马射线爆发的全面研究：ii。非常短的爆发及其含义
A Comprehensive Study of Bright Fermi-GBM Short Gamma-Ray Bursts: II. Very Short Burst and Its Implications
论文作者
论文摘要
建议热成分是几个明亮的伽马射线爆发（GRB）的射出的物理组成。在几个短GRB和长GRB的时间集成光谱中发现了这种热成分。在这项工作中，我们对Fermi Gamma-ray爆发显示器检测到的十个非常短的GRB进行了全面分析，以搜索热成分。我们发现，所得的低能频谱指数和每个GRB中的峰值都意味着一个常见的硬光谱特征，这有利于GRB持续时间在短/硬/软/软二分法的主要分类中。我们还发现了八个GRB中热成分检测的中等证据。尽管这样的热成分贡献了一小部分全局及时伽马射线的发射，但修改后的热辐射机制可以显着增强该比例，例如在亚光层耗散中。
A thermal component is suggested to be the physical composition of the ejecta of several bright gamma-ray bursts (GRBs). Such a thermal component is discovered in the time-integrated spectra of several short GRBs as well as long GRBs. In this work, we present a comprehensive analysis of ten very short GRBs detected by Fermi Gamma-Ray Burst Monitor to search for the thermal component. We found that both the resultant low-energy spectral index and the peak energy in each GRB imply a common hard spectral feature, which is in favor of the main classification of the short/hard versus long/soft dichotomy in the GRB duration. We also found moderate evidence for the detection of thermal component in eight GRBs. Although such a thermal component contributes a small proportion of the global prompt gamma-ray emission, the modified thermal-radiation mechanism could enhance the proportion significantly, such as in subphotospheric dissipation.
