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Title: Evidence for intrinsic absorption in the Swift X-ray afterglows
Authors: Campana, Sergio
Romano, Patrizia
Covino, S.
Lazzati, D.
De Luca, A.
Chincarini, Guido
Moretti, Alberto
Tagliaferri, Gianpiero
Cusumano, Giancarlo
Giommi, Paolo
Mangano, V.
Perri, M.
La Parola, V.
Capalbi, M.
Mineo, T.
Antonelli, A.
Burrows, David N.
Hill, Joanne E.
Racusin, Judith L.
Kennea, Jamie A.
Morris, David C.
Pagani, Claudio
Nousek, John A.
Osborne, Julian P.
Goad, Michael R.
Page, Kim L.
Beardmore, Andrew P.
Godet, Olivier
O'Brien, Paul T.
Wells, Alan A.
Angelini, Lorella
Gehrels, Neil
First Published: 2006
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2006, 449, pp.61-65.
Abstract: Gamma-ray burst (GRB) progenitors are observationally linked to the death of massive stars. X-ray studies of the GRB afterglows can deepen our knowledge of the ionization status and metal abundances of the matter in the GRB environment. Moreover, the presence of local matter can be inferred through its fingerprints in the X-ray spectrum, i.e. the presence of absorption higher than the Galactic value. A few studies based on BeppoSAX and XMM-Newton found evidence of higher than Galactic values for the column density in a number of GRB afterglows. Here we report on a systematic analysis of 17 GRBs observed by Swift up to April 15, 2005. We observed a large number of GRBs with an excess of column density. Our sample, together with previous determinations of the intrinsic column densities for GRBs with known redshift, provides evidence for a distribution of absorption consistent with that predicted for randomly occurring GRB within molecular clouds.
DOI Link: 10.1051/0004-6361:20053823
ISSN: 0004-6361
eISSN: 1432-0746
Version: Publisher PDF
Status: Peer-reviewed
Type: Article
Rights: © The European Southern Observatory (ESO) 2006. Deposited with permission of the publisher.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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