The distribution of equivalent widths in long GRB afterglow spectra

Context. The extreme brightness of gamma-ray burst (GRB) afterglows and their simple spectral shape make them ideal beacons to study the interstellar medium of their host galaxies through absorption line spectroscopy at almost any redshift.

Detalles Bibliográficos
Autores: Ugarte Postigo, Antonio de, Fynbo, J. P. U., Thöne, Cristina Carina, Christensen, L., Gorosabel, Javier, Milvang-Jensen, B., Schulze, S., Jakobsson, P., Wiersema, K., Sánchez-Ramírez, R., Leloudas, G., Zafar, T., Malesani, D., Hjorth, Jens
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2012
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/422794
Acceso en línea:http://hdl.handle.net/10261/422794
Access Level:acceso abierto
Palabra clave:Gamma-ray burst: general
Techniques: spectroscopic
Galaxies: ISM
Galaxies: high-redshift
Dust, extinction
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dc.title.none.fl_str_mv The distribution of equivalent widths in long GRB afterglow spectra
title The distribution of equivalent widths in long GRB afterglow spectra
spellingShingle The distribution of equivalent widths in long GRB afterglow spectra
Ugarte Postigo, Antonio de
Gamma-ray burst: general
Techniques: spectroscopic
Galaxies: ISM
Galaxies: high-redshift
Dust, extinction
title_short The distribution of equivalent widths in long GRB afterglow spectra
title_full The distribution of equivalent widths in long GRB afterglow spectra
title_fullStr The distribution of equivalent widths in long GRB afterglow spectra
title_full_unstemmed The distribution of equivalent widths in long GRB afterglow spectra
title_sort The distribution of equivalent widths in long GRB afterglow spectra
dc.creator.none.fl_str_mv Ugarte Postigo, Antonio de
Fynbo, J. P. U.
Thöne, Cristina Carina
Christensen, L.
Gorosabel, Javier
Milvang-Jensen, B.
Schulze, S.
Jakobsson, P.
Wiersema, K.
Sánchez-Ramírez, R.
Leloudas, G.
Zafar, T.
Malesani, D.
Hjorth, Jens
author Ugarte Postigo, Antonio de
author_facet Ugarte Postigo, Antonio de
Fynbo, J. P. U.
Thöne, Cristina Carina
Christensen, L.
Gorosabel, Javier
Milvang-Jensen, B.
Schulze, S.
Jakobsson, P.
Wiersema, K.
Sánchez-Ramírez, R.
Leloudas, G.
Zafar, T.
Malesani, D.
Hjorth, Jens
author_role author
author2 Fynbo, J. P. U.
Thöne, Cristina Carina
Christensen, L.
Gorosabel, Javier
Milvang-Jensen, B.
Schulze, S.
Jakobsson, P.
Wiersema, K.
Sánchez-Ramírez, R.
Leloudas, G.
Zafar, T.
Malesani, D.
Hjorth, Jens
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Danish National Research Foundation
Ministerio de Ciencia e Innovación (España)
European Commission
Icelandic Research Fund
Swedish Research Council
Agence Nationale de la Recherche (France)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Gamma-ray burst: general
Techniques: spectroscopic
Galaxies: ISM
Galaxies: high-redshift
Dust, extinction
topic Gamma-ray burst: general
Techniques: spectroscopic
Galaxies: ISM
Galaxies: high-redshift
Dust, extinction
description Context. The extreme brightness of gamma-ray burst (GRB) afterglows and their simple spectral shape make them ideal beacons to study the interstellar medium of their host galaxies through absorption line spectroscopy at almost any redshift.
publishDate 2012
dc.date.none.fl_str_mv 2012
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/422794
url http://hdl.handle.net/10261/422794
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/MICINN//AYA2010-21887-C04-01
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http://dx.doi.org/10.1051/0004-6361/201219894
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dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
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spelling The distribution of equivalent widths in long GRB afterglow spectraUgarte Postigo, Antonio deFynbo, J. P. U.Thöne, Cristina CarinaChristensen, L.Gorosabel, JavierMilvang-Jensen, B.Schulze, S.Jakobsson, P.Wiersema, K.Sánchez-Ramírez, R.Leloudas, G.Zafar, T.Malesani, D.Hjorth, JensGamma-ray burst: generalTechniques: spectroscopicGalaxies: ISMGalaxies: high-redshiftDust, extinctionContext. The extreme brightness of gamma-ray burst (GRB) afterglows and their simple spectral shape make them ideal beacons to study the interstellar medium of their host galaxies through absorption line spectroscopy at almost any redshift.Aims. We describe the distribution of rest-frame equivalent widths (EWs) of the most prominent absorption features in GRB afterglow spectra, providing the means to compare individual spectra to the sample and identify its peculiarities.Methods. Using 69 low-resolution GRB afterglow spectra, we conduct a study of the rest-frame EWs distribution of features with an average rest-frame EW larger than 0.5 Å. To compare an individual GRB with the sample, we develop EW diagrams as a graphical tool, and we give a catalogue with diagrams for the 69 spectra. We introduce a line strength parameter (LSP) that allows us to quantify the strength of the absorption features in a GRB spectrum as compared to the sample by a single number. Using the distributions of EWs of single-species features, we derive the distribution of their column densities by a curve of growth (CoG) fit.Results. We find correlations between the LSP and the extinction of the GRB, the UV brightness of the host galaxies and the neutral hydrogen column density. However, we see no significant evolution of the LSP with the redshift. There is a weak correlation between the ionisation of the absorbers and the energy of the GRB, indicating that, either the GRB event is responsible for part of the ionisation, or that galaxies with high-ionisation media produce more energetic GRBs. Spectral features in GRB spectra are, on average, 2.5 times stronger than those seen in QSO intervening damped Lyman-α (DLA) systems and slightly more ionised. In particular we find a larger excess in the EW of C ivλλ1549 relative to QSO DLAs, which could be related to an excess of Wolf-Rayet stars in the environments of GRBs. From the CoG fitting we obtain an average number of components in the absorption features of GRBs of 6.00-1.25+1.00. The most extreme ionisation ratios in our sample are found for GRBs with low neutral hydrogen column density, which could be related to ionisation by the GRB emission. © 2012 ESO.We thank the anonymous referee for providing construc- tive comments. We thank D. A. Kann for fruitful discussions. The Dark Cosmology Centre is funded by the DNRF. This research has made use of the GHostS database (http://www.grbhosts.org), which is partly funded by Spitzer/NASA grant RSA Agreement No. 1287913. The research ac- tivity of A.d.U.P., C.T., R.S.R. and J.G. is supported by Spanish research projects AYA2011-24780/ESP, AYA2009-14000-C03-01/ESP and AYA2010- 21887-C04-01. J.P.U.F. and B.M.J. acknowledge support from the ERC-StG grant EGGS-278202. S.S. acknowledges support by a Grant of Excellence from the Icelandic Research Fund. G.L. is supported by the Swedish Research Council through grant No. 623-2011-7117. T.Z. is funded within the BINGO! (history of Baryons: INtergalactic medium/Galaxies cO-evolution) project by the Agence Nationale de la Recherche (ANR) under the allocation ANR-08-BLAN-0316-01.Peer reviewedEDP SciencesDanish National Research FoundationMinisterio de Ciencia e Innovación (España)European CommissionIcelandic Research FundSwedish Research CouncilAgence Nationale de la Recherche (France)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/422794reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MICINN//AYA2011-24780info:eu-repo/grantAgreement/MICINN//AYA2009-14000-C03-01info:eu-repo/grantAgreement/MICINN//AYA2010-21887-C04-01info:eu-repo/grantAgreement/EC/FP7/278202http://dx.doi.org/10.1051/0004-6361/201219894Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4227942026-05-22T06:33:51Z
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