Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-08-29
Astronomy and Astrophysics
Astrophysics
9 pages, 4 figures; The Astrophysical Journal, in press (2008 Oct 1 issue)
Scientific paper
10.1086/591049
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.
Kann David Alexander
Klose Sylvio
Li Aigen
Liang Shun-Lin
Wang Ying-Jian
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