Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds
Delayed onset and fast rise of prompt optical-UV emission from gamma-ray bursts in molecular clouds
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DOI：
10.1088/1674-4527/13/1/007
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发表时间：
2012-11
影响因子：
1.8
通讯作者：
X. Cui;Zhuo Li;L. Xin
中科院分区：
文献类型：
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作者：
X. Cui;Zhuo Li;L. Xin
观测表明，长γ射线暴（GRB）起源于大质量恒星的爆炸，因此它们可能发生在它们的祖先诞生的分子云中。我们发现，由于尘埃消光，GRB的瞬时光紫外辐射可能被延迟，这可以很好地解释观测到的GRB 080319 B的光学延迟启动和快速上升。GRB 080319 B周围的分子云的密度和大小分别被粗略地限制在103 cm−3和108 pc。我们还调查了其他伽玛暴与即时光学紫外数据，并找到类似的本地分子云的密度和大小的值。未来对伽玛暴在亚秒量级上的瞬时光紫外辐射的观测，如UFFO-Pathfinder和SVOM-GWAC，将为伽玛暴的局部环境提供更多的证据和探测。
Observations imply that long γ-ray bursts (GRBs) originate from the explosions of massive stars, therefore they may occur in the molecular clouds where their progenitors were born. We show that the prompt optical-UV emission from GRBs may be delayed due to dust extinction, which can explain the observed optical delayed onset and fast rise in GRB 080319B well. The density and the size of the molecular cloud around GRB 080319B are roughly constrained to be ∼ 103 cm−3 and ∼ 8 pc, respectively. We also investigate other GRBs with prompt optical-UV data, and find similar values of the densities and sizes of the local molecular clouds. Future observations of prompt optical-UV emission from GRBs on a timescale of subseconds, e.g. by UFFO-Pathfinder and SVOM-GWAC, will provide more evidence and probes of the local environments of GRBs.