伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

星期二, 十二月 02, 2008

Kumar 2008 GRB 080319B可能来自于外激波的扰动

主要内容:
辐射机制还是SSC

他们从光变相似认为光学和伽玛来自同一个地方; 另外, 没有考虑黑体辐射的限制. 而且认为辐射半径~10^17cm, 可能超过了减速半径.

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文章信息:

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Title:
Gamma-ray Burst 080319B: Evidence for Relativistic Turbulence, Not Internal Shocks
Authors:
Kumar, Pawan; Narayan, Ramesh
Publication:
eprint arXiv:0812.0021
Publication Date:
11/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
submitted to MNRAS
Bibliographic Code:
2008arXiv0812.0021K

Abstract

We show that the excellent optical and gamma-ray data available for GRB 080319B rule out the internal shock model for the prompt emission. The data instead point to a model in which the observed radiation was produced close to the deceleration radius ($\sim10^{17}$ cm) by a turbulent source with random Lorentz factors $\sim10$ in the comoving frame. The optical radiation was produced by synchrotron emission from relativistic electrons, and the gamma-rays by inverse Compton scattering of the synchrotron photons. The gamma-ray emission originated both in eddies and in an inter-eddy medium, whereas the optical radiation was mostly from the latter. Therefore, the gamma-ray emission was highly variable whereas the optical was much less variable. The model explains all the observed features in the prompt optical and gamma-ray data of GRB 080319B. We are unable to determine with confidence whether the energy of the explosion was carried outward primarily by particles (kinetic energy) or magnetic fields. Consequently, we cannot tell whether the turbulent medium was located in the reverse shock (we can rule out the forward shock) or in a Poynting-dominated jet.
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