Lorentz factor constraint from the very early external shock of the gamma-ray burst ejecta
Lorentz factor constraint from the very early external shock of the gamma-ray burst ejecta
复制标题
来自伽马射线爆发喷射物的早期外部冲击的洛伦兹因子约束
DOI:
10.1111/j.1365-2966.2009.15863.x
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发表时间:
2009-08
影响因子:
4.8
通讯作者:
Zou, Yuan-Chuan
中科院分区:
文献类型:
--
作者:
Piran, Tsvi;Zou, Yuan-Chuan
While it is generally agreed that the emitting regions in Gamma-Ray Bursts (GRBs) move ultra relativistically towards the observer, different es timates of the initial Lorentz factors, 0, lead to different, at times conflicting estimates. We show h ere that the quiet periods in which the signals goes down below the instrumental thresholds, put strong upper limits on the values of 0. According to the standard internal-external shocks model an external shock should develop during the prompt stage. This external shock radiates in the hard X-rays to soft gamma-rays bands and this emission should be seen as a smooth background signal. The observed deep minima indicate that this contribution is negligible. This limits, in turn, 0. We obtain upper limits on 0 for several bursts with typical values around hundreds. We compare these values with those obtained by the other methods, which typically yield lower limits. The results are marginally consistent leaving only a narrow range of allowed values for 0.
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DOI:
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发表时间:
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影响因子:
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