Giannios 2009 激波加速电子的热成份

主要内容:
PIC模拟得到热电子, 解释早期光变的陡降. (不过任何一个绝热演化都可以陡降啊)

不过热电子, 热谱本身还是有意思的.

精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0905.1970)

· References in the Article

·

· Translate This Page

Title:		Signatures of a Thermal Component in Shock-Accelerated Electrons in GRBs
Authors:		Giannios, Dimitrios; Spitkovsky, Anatoly
Publication:		eprint arXiv:0905.1970
Publication Date:		05/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		6 pages, 8 figures, MNRAS submitted
Bibliographic Code:		2009arXiv0905.1970G

Abstract

Recent particle-in-cell simulations suggest that a large fraction of the energy dissipated in a relativistic shock is deposited into a thermal distribution of electrons that is connected to the high-energy power-law tail. Here, we explore the observational implications of such a mixed thermal-nonthermal particle distribution for the afterglow and prompt emission of gamma-ray bursts. When the thermal component dominates the energy budget, the afterglow lightcurves show a very steep decline phase followed by a more shallow decay when the characteristic synchrotron frequency crosses the observed band. The steep decay appears in the X-rays at ~100 sec after the burst and is accompanied by a characteristic hard-soft-hard spectral evolution that has been observed in a large number of early afterglows. If internal shocks produce a similar mixed electron distribution, a thermal-like bump is expected at the synchrotron peak of the nu*f_nu spectrum.

---

Bibtex entry for this abstract Preferred format for this abstract (see Preferences)