Gamma‐Ray Burst Afterglows as Probes of Environment and Blast Wave Physics. I. Absorption by Host‐Galaxy Gas and Dust

2006/10/31 by R. L. C. Starling, R. A. M. J. Wijers, K. Wiersema +5 · 2 citations
Physics and Astronomy · #Absorption (acoustics) #Afterglow #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Extinction (optical mineralogy) #Galaxy #Gamma-ray burst #Gamma-ray bursts and supernovae #Metallicity #Milky Way #Optics #Physics #Pulsars and Gravitational Waves Research #astro-ph

paper · pdf · doi:10.1086/511953

25 pages, 5 figures, ApJ accepted. Minor revisions to Table 1, Sections 4.1.4 and 5.1.5

arxiv created 2006/12/18 · openalex publication_date 2007/05/29 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05

Abstract

We use a new approach to obtain limits on the absorbing columns toward an initial sample of 10 long gamma-ray bursts observed with BeppoSAX and selected on the basis of their good optical and near-infrared (NIR) coverage, from simultaneous fits to NIR, optical, and X-ray afterglow data, in count space and including the effects of metallicity. In no cases is a Milky Way-like (MW) extinction preferred when testing MW, LMC, and SMC extinction laws. The 2175 Å bump would in principle be detectable in all these afterglows, but is not present in the data. An SMC-like gas-to-dust ratio or lower value can be ruled out for four of the hosts analyzed here (assuming SMC metallicity and extinction law), while the remainder of the sample have too large an error to discriminate. We provide a more accurate estimate of the line-of-sight extinction and improve on the uncertainties for the majority of the extinction measurements made in previous studies of this sample. We discuss this method for determining extinction values in comparison with the most commonly employed existing methods.

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Cited by

• The extinction curves of star-forming regions fromz = 0.1 to 6.7 using GRB afterglow spectroscopy
• A tale of two GRB-SNe at a common redshift of z=0.54