Dust and gas in the local environments of gamma-ray bursts
Date
2006Author
Roming, P. W. A.
Immler, S.
Romano, P.
Berg, D. V.
DE PASQUALE, Massımılıano
Schady, P.
Mason, K. O.
Page, M. J.
Metadata
Show full item recordAbstract
From spectral analysis on the XRT/UVOT Spectral Energy Distribution (SED) on a sample of Swift GRBs we determine the host galaxy hydrogen column density, N-H,N-X, and visual dust-extinction, AV. All but one GRBs have host galaxy dust properties that are most consistent with an SMC or LMC dust extinction law, with a range in AV from 0.11 +/- 0.07 to 0.88(-0.20)(+0.23) mags, although selection effects distort the true AV distribution. We estimate that GR13s with no afterglow detected blueward of 5500 angstrom to have an average rest-frame extinction almost seven times the average in our sample. This may help account for the similar to 1/3 of GRBs observed by Swift that have no afterglow detected by UVOT.
Collections
- Makale [92796]