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Title: Variable Lyα sheds light on the environment surrounding GRB 090426
Authors: Campana, S.
de Ugarte Postigo A.
Lazzati, D.
de Ugarte Postigo A.
Fynbo, J. P. U.
Hjorth, J.
Malesani, D.
Milvang-Jensen, B.
Christensen, L.
Levan, A. J.
Aloy, M. A.
Jakobsson, P.
Levesque, E. M.
Roming, P. W. A.
Tanvir, N. R.
Wiersema, K.
Gladders, M.
Wuyts, E.
Dahle, H.
First Published: 11-Jun-2011
Publisher: Oxford University Press (OUP)
Citation: Monthly Notices of the Royal Astronomical Society , 2011, 414 (1), pp. 479-488
Abstract: Long duration gamma-ray bursts are commonly associated with the deaths of massive stars. Spectroscopic studies using the afterglow as a light source provide a unique opportunity to unveil the medium surrounding it, probing the densest region of their galaxies. This material is usually in a low ionization state and at large distances from the burst site, hence representing the normal interstellar medium in the galaxy. Here we present the case of GRB 090426 at z= 2.609, whose optical spectrum indicates an almost fully ionized medium together with a low column density of neutral hydrogen. For the first time, we also observe variations in the Lyα absorption line. Photoionization modelling shows that we are probing material from the vicinity of the burst (∼80 pc). The host galaxy is a complex of two luminous interacting galaxies, which might suggest that this burst could have occurred in an isolated star-forming region outside its host galaxy created in the interaction of the two galaxies.
DOI Link: 10.1111/j.1365-2966.2011.18408.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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