Parsons 2009 短暴的环境也比较致密

主要内容:
按说短暴的环境应该是IGM, 但是余辉拟合的密度都比较大.

此文提了个模型解释为什么比较大.

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Title:		Short Gamma Ray Bursts and their Afterglow Signatures in Dense Stellar Systems
Authors:		Parsons, Rion K.; Ramirez-Ruiz, Enrico; Lee, William H.
Publication:		eprint arXiv:0904.1768
Publication Date:		04/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		9 pages, 3 figures, submitted to ApJ
Bibliographic Code:		2009arXiv0904.1768P

Abstract

The hypothesis that short GRBs arise from the coalescence of binary compact stars has recently gained support. With this comes the expectation that the afterglow should bear the characteristic signature of a tenuous intergalactic medium (IGM). However, fits to the observational data suggest that some detected afterglows arise in relatively dense gaseous environments rather than in the low density IGM. Here we show that considering the effect of red giant winds in the core of a star cluster may resolve this paradox if short GRB progenitors are contained in such an environment and close encounters rather than pure gravitational wave emission brings the compact objects together. Clear confirmation is provided here of the important notion that the morphology and visibility of short gamma-ray burst remnants are determined largely by the state of the gas in the cluster's core.

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