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
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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
Zou, Yuan-Chuan
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Piran, Tsvi;Zou, Yuan-Chuan

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虽然人们普遍认为伽玛射线暴(GRB)中的发射区域以超相对论的方式向观测者移动,但对初始洛伦兹因子0的不同估计会导致不同的估计,有时会相互矛盾。我们在这里表明,在安静的时期,信号下降到仪器阈值以下,把强大的上限值为0。根据标准的内部-外部冲击模型,外部冲击应在瞬发阶段形成。这种外部冲击辐射在硬X射线到软伽马射线波段,这种发射应该被视为一个平滑的背景信号。观察到的深极小值表明,这种贡献可以忽略不计。这反过来限制了0。我们得到的上限为0的几个突发的典型值约数百。我们将这些值与通过其他方法获得的值进行比较,这些方法通常会产生较低的限值。结果是勉强一致的,仅留下0的允许值的窄范围。
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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