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爆发的起源
DOI:
10.1063/1.3509250
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发表时间:
2010-04
期刊:
影响因子:
--
通讯作者:
Cui, Xiaohong
中科院分区:
文献类型:
--
作者:
Cui, Xiaohong
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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期刊:
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