Origins of short gamma-ray bursts deduced from offsets in their host galaxies revisited
Origins of short gamma-ray bursts deduced from offsets in their host galaxies revisited
复制标题
重新审视从宿主星系的偏移推断出的短伽马射线暴的起源
DOI：
10.1088/1674-4527/12/9/006
复制
发表时间：
2012
影响因子：
1.8
通讯作者：
Ren-Xin
中科院分区：
文献类型：
--
作者：
Cui;Xiao-Hong; Nagataki;Shigehiro: Aoi;Junichi ; Xu;Ren-Xin
短伽玛射线暴（GRB）在宿主星系中的空间分布为我们提供了研究其起源的机会。基于目前观测到的短伽玛暴相对于其宿主星系的分布，我们得到了在早、晚型宿主星系中，追踪致密双星合并的分量和追踪星星形成率（如大质量恒星）的分量的分数。通过对投影偏移量分布的分析，我们发现文献中仅基于星族综合和大质量星星模型的22个短伽玛暴样本的大质量星比例为0.37+ 0.42− 0.37，误差在1σ水平。从这些结果来看，很难接受的是，短伽玛暴的起源与观测统计是很好地描述了目前的模型，仅使用的偏移分布。短伽玛暴观测定位的不确定性也强烈影响所得到的分数。
The spatial distribution of short Gamma-ray bursts (GRBs) in their host galaxies provides us with an opportunity to investigate their origins. Based on the currently observed distribution of short GRBs relative to their host galaxies, we obtain the fraction of the component that traces the mergers of binary compact objects and the one that traces star formation rate (such as massive stars) in early-and late-type host galaxies. From the analysis of projected offset distribution and only based on population synthesis and massive star models, we find that the fraction of massive stars is 0.37+ 0.42− 0.37 with an error at the 1σ level for a sample with 22 short GRBs in the literature. From these results, it is hard to accept that the origin of short GRBs with observed statistics is well described by current models using only the offset distribution. The uncertainties in observational localizations of short GRBs also strongly affect the resulting fraction.