A peculiarly short-duration gamma-ray burst from massive star core collapse

A peculiarly short-duration gamma-ray burst from massive star core collapse
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大规模星核塌陷产生的持续时间特别短的伽马射线爆发

DOI:
10.1038/s41550-021-01395-z
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发表时间:
2021-05
期刊:
影响因子:
14.1
通讯作者:
Zhang B.
Zhang B.
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Zhang B. -B.;Liu Z. -K.;Peng Z. -K.;Li Y.;Lu H. -J.;Yang J.;Yang Y. -S.;Yang Y. -H.;Meng Y. -Z.;Zou J. -H.;Ye H. -Y.;Wang X. -G.;Mao J. -R.;Zhao X. -H.;Bai J. -M.;Castro-Tirado A. J.;Hu Y. -D.;Dai Z. -G.;Liang E. -W.;Zhang B.

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基于观测到的持续时间双峰分布,伽玛暴在现象学上被分为长暴和短暴。近年来的多波长和多信使观测表明,一般来说,长伽马射线暴起源于大质量恒星核心坍缩事件,而短伽马射线暴起源于双中子星合并事件。众所周知,持续时间标准有时是不可靠的,需要多波长标准来确定特定GRB的物理起源。一些明显的长伽马射线暴被认为是中子星合并的起源,而一些明显的短伽马射线暴被认为是真正的长伽马射线暴,其短而明亮的辐射略高于探测器的灵敏度阈值。在这里,我们报告了对短而亮的GRB 200826A的多波长数据的综合分析。这次爆发的特征是一个尖锐的脉冲,持续时间为1秒,没有证据表明潜在的持续时间更长的事件。然而,它的其他观测特性,如光谱行为、总能量和宿主星系偏移量,与其他被认为起源于双中子星合并的短伽马射线暴不一致。相反,这些性质类似于长伽马射线暴。这次爆发证实了恒星核心坍缩起源的短持续时间grb的存在,并对现有模型提出了一些挑战。
Gamma-ray bursts (GRBs) have been phenomenologically classified into long and short populations based on the observed bimodal distribution of duration. Multi-wavelength and multi-messenger observations in recent years have revealed that in general long GRBs originate from massive star core collapse events, whereas short GRBs originate from binary neutron star mergers. It has been known that the duration criterion is sometimes unreliable, and multi-wavelength criteria are needed to identify the physical origin of a particular GRB. Some apparently long GRBs have been suggested to have a neutron star merger origin, whereas some apparently short GRBs have been attributed to genuinely long GRBs whose short, bright emission is slightly above the detector’s sensitivity threshold. Here, we report the comprehensive analysis of the multi-wavelength data of the short, bright GRB 200826A. Characterized by a sharp pulse, this burst shows a duration of 1 second and no evidence of an underlying longer-duration event. Its other observational properties such as its spectral behaviours, total energy and host galaxy offset are, however, inconsistent with those of other short GRBs believed to originate from binary neutron star mergers. Rather, these properties resemble those of long GRBs. This burst confirms the existence of short-duration GRBs with stellar core-collapse origin, and presents some challenges to the existing models.
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