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
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重新审视从宿主星系的偏移推断出的短伽马射线爆发的起源

DOI:
10.1063/1.3509250
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发表时间:
2010-04
期刊:
Research of Astronomy and Astrophysics
影响因子:
--
通讯作者:
Cui, Xiaohong
Cui, Xiaohong
中科院分区:
其他
文献类型:
--
作者:
Cui, Xiaohong

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短伽马射线暴(GRB)在其宿主星系中的空间分布为我们提供了研究其起源的机会。根据目前观测到的短伽玛暴相对于其宿主星系的分布,我们获得了追踪双致密天体合并的成分和追踪早型和晚型宿主星系中恒星形成率(例如大质量恒星)的成分的比例。通过对预计偏移量分布的分析,仅基于星群综合和大质量恒星模型,我们发现文献中具有22个短伽马暴的样本中,大质量恒星的比例为0.37+0.42−0.37,误差在1σ水平。从这些结果来看,很难接受仅使用偏移量分布的当前模型可以很好地描述具有观测统计数据的短伽马暴的起源。短伽马暴观测定位的不确定性也强烈影响所得分数。
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.
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