Asano 2008 光子主导的伽玛暴的高能辐射

主要内容:


精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0807.0951)

· References in the Article

· Also-Read Articles (Reads History)

·

· Translate This Page

Title:		Prompt High-Energy Emission from Proton-Dominated Gamma-Ray Bursts
Authors:		Asano, Katsuaki; Inoue, Susumu; Mészáros, Peter
Publication:		eprint arXiv:0807.0951
Publication Date:		07/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		13 pages, 5 figures
Bibliographic Code:		2008arXiv0807.0951A

Abstract

The prompt emission of gamma-ray bursts (GRBs) is widely thought to be radiation from accelerated electrons, but an appreciably larger amount of energy could be carried by accelerated protons, particularly if GRBs are the sources of ultra-high-energy cosmic rays (UHECRs). We model the expected photon spectra for such ``proton-dominated'' GRBs in the internal shock scenario through Monte Carlo simulations, accounting for various processes related to high-energy electrons and protons. Besides proton and muon synchrotron components, emission from photomeson-induced secondary pair cascades becomes crucial, generally enhancing the GeV-TeV and/or eV-keV photons and offering a signature of UHE protons. In some cases, it can overwhelm the primary electron component and result in GRBs peaking in the 10 MeV - 1 GeV range, which may be relevant to some bursts discussed in a recent re-analysis of EGRET TASC data. The dependence of the spectra on key quantities such as the bulk Lorentz factor, magnetic field and proton-to-electron ratio is nontrivial due to the nonlinear nature of cascading and the interplay of electron- and proton-induced components. Observations by {\it GLAST}, ground-based telescopes and other facilities should test these expectations and provide critical constraints on the proton acceleration efficiency.

---

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