Ghisellini 2008 准热谱的逆康普顿作为伽玛暴的辐射机制

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同步辐射处于光学后. 种子光子由同步提供, 可有多次IC.

辐射谱为低能段 nu^0, 高能端cutoff

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Title:		Quasi-thermal Comptonization and Gamma-Ray Bursts
Authors:		Ghisellini, Gabriele; Celotti, Annalisa
Publication:		The Astrophysical Journal, Volume 511, Issue 2, pp. L93-L96. (ApJ Homepage)
Publication Date:		02/1999
Origin:		APJ
ApJ Keywords:		GAMMA RAYS: BURSTS, RADIATION MECHANISMS: NONTHERMAL, RADIATION MECHANISMS: THERMAL, X-RAYS: GENERAL
Abstract Copyright:		(c) 1999: The American Astronomical Society
DOI:		10.1086/311845
Bibliographic Code:		1999ApJ...511L..93G

Abstract

Quasi-thermal Comptonization in internal shocks formed between relativistic shells can account for the high-energy emission of gamma-ray bursts. This is in fact the dominant cooling mechanism if the typical energy of the emitting particles is achieved either through the balance between heating and cooling or as a result of electron-positron pair production. Both processes yield subrelativistic or mildly relativistic energies. In this case, the synchrotron spectrum is self-absorbed, providing the soft-seed photons for the Comptonization process, whose spectrum is flat [F(nu)~const], ending in either an exponential cutoff or a Wien peak, depending on the scattering optical depth of the emitting particles. The self-consistent particle energy and optical depth are estimated and found in agreement with the observed spectra.

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