Küpcü 2010 暗暴GRB 020819的宿主星系的消光很大

主要内容:

A_v=1.8-2.6，很大（很大吗？银河系消光多少？也是2-4之间啊）。说是暗暴可能原因就是星系的消光引起的。

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Title:		Highly Extinguished Host Galaxy of the Dark GRB 020819
Authors:		Küpcü Yoldaş, A.; Greiner, J.; Klose, S.; Krühler, T.; Savaglio, S.
Publication:		eprint arXiv:1005.1257
Publication Date:		05/2010
Origin:		ARXIV
Keywords:		Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:		Accepted for publication in A&A Letters
Bibliographic Code:		2010arXiv1005.1257K

Abstract

We analyse the properties of the host galaxy of the optically dark gamma-ray burst (GRB) 020819 (z = 0.41) and discuss the possible implications in the context of "dark" GRBs. We present g'r'i'z'JHK photometry of the host galaxy and fit the broad spectral energy distribution including the public Spitzer IRAC data using stellar population models. The broad spectral energy distribution (SED) indicates a high extinction, A_V ~ 1.8 - 2.6 mag, for this relatively massive galaxy. This is the highest global extinction for a GRB host galaxy with a robust spectroscopic redshift. The properties of the host galaxy are indicative of dusty, intense star-formation, which differ from those of the current sample of GRB hosts. This implies that the dust extinction is one of the main reasons for the darkness of low-redshift bursts and that the long GRB host population is far more diverse than previously anticipated.

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