Li 2008 伽玛暴宿主星系的尘埃消光

主要内容:
给出消光曲线的公式。

精彩摘抄:


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Title:		On Dust Extinction of Gamma-ray Burst Host Galaxies
Authors:		Li, Aigen; Liang, S. L.; Kann, D. A.; Wei, D. M.; Klose, S.; Wang, Y. J.
Publication:		eprint arXiv:0808.4115
Publication Date:		08/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		9 pages, 4 figures; The Astrophysical Journal, in press (2008 Oct 1 issue)
Bibliographic Code:		2008arXiv0808.4115L

Abstract

Although it is well recognized that gamma-ray burst (GRB) afterglows are obscured and reddened by dust in their host galaxies, the wavelength-dependence and quantity of dust extinction are still poorly known. Current studies on this mostly rely on fitting the afterglow spectral energy distributions (SEDs) with template extinction models. The inferred extinction (both quantity and wavelength-dependence) and dust-to-gas ratios are often in disagreement with that obtained from dust depletion and X-ray spectroscopy studies. We argue that this discrepancy could result from the prior assumption of a template extinction law. We propose an analytical formula to approximate the GRB host extinction law. With the template extinction laws self-contained, and the capability of revealing extinction laws differing from the conventional ones, it is shown that this is a powerful approach in modeling the afterglow SEDs to derive GRB host extinction.

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