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arXiv 0812.0318astro-ph
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从GRB 080319 B的即时发射中获得的线索

Clues from the prompt emission of GRB 080319B

Y. C. Zou, T. Piran, R. Sari

摘要:

伴随GRB 080319 B而来的极其明亮的闪光,乍一看,暗示着这次爆发中的瞬发$γ$ -射线是由同步加速器自康普顿(SSC)产生的。我们在这里分析所观察到的光学和$γ$光谱。我们发现,非常强的光发射构成,由于自吸收,非常强的约束发射过程,并把光发射的起源在一个非常大的半径,几乎不一致的内部冲击。或者,它需要一个非常大的随机洛伦兹因子的电子。我们发现SSC不可能产生瞬发$γ$射线。我们还表明,光发射和$γ$射线不能产生同步辐射从两个群体的电子在同一个发射区域。因此,我们必须得出结论,光学和$γ$射线是在不同的物理区域产生的。对观测结果的一种可能解释是,$γ$射线来自内部激波,而闪光则来自外部激波发射。这与在光学和$γ$射线信号之间观察到的几秒钟延迟是一致的。

英文摘要:

The extremely bright optical flash that accompanied GRB 080319B suggested, at first glance, that the prompt $γ$-rays in this burst were produced by Synchrotron self Compton (SSC). We analyze here the observed optical and $γ$ spectrum. We find that the very strong optical emission poses, due to self absorption, very strong constraints on the emission processes and put the origin of the optical emission at a very large radius, almost inconsistent with internal shock. Alternatively it requires a very large random Lorentz factor for the electrons. We find that SSC could not have produced the prompt $γ$-rays. We also show that the optical emission and the $γ$ rays could not have been produced by synchrotron emission from two populations of electron within the same emitting region. Thus we must conclude that the optical and the $γ$-rays were produced in different physical regions. A possible interpretation of the observations is that the $γ$-rays arose from internal shocks but the optical flash resulted from external shock emission. This would have been consistent with the few seconds delay observed between the optical and $γ$-rays signals.

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