On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4

The XQ-100 survey provides optical and near-infrared coverage of 36 blindly selected, intervening damped Lyman α systems (DLAs) at 2 < z < 4, simultaneously covering the MgII doublet at λλ2796, 2803Å, and the Ly α transition. Using the XQ-100 DLA sample, we investigate the completeness of sele...

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Authors: Berg, Trystyn A. M., Ellison, Sara L., Prochaska, J. Xavier, Sánchez Ramírez, Rubén, Lopez, S., D'Odorico, Valentina, Becker, G., Christensen, L., Cupani, G., Denney, K., Worseck, Gábor
Format: article
Status:Published version
Publication Date:2017
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/376295
Online Access:http://hdl.handle.net/10261/376295
Access Level:Open access
Keyword:Galaxies: abundances
Galaxies: high-redshift
Galaxies: ISM
Quasars: absorption lines
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spelling On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4Berg, Trystyn A. M.Ellison, Sara L.Prochaska, J. XavierSánchez Ramírez, RubénLopez, S.D'Odorico, ValentinaBecker, G.Christensen, L.Cupani, G.Denney, K.Worseck, GáborGalaxies: abundancesGalaxies: high-redshiftGalaxies: ISMQuasars: absorption linesThe XQ-100 survey provides optical and near-infrared coverage of 36 blindly selected, intervening damped Lyman α systems (DLAs) at 2 < z < 4, simultaneously covering the MgII doublet at λλ2796, 2803Å, and the Ly α transition. Using the XQ-100 DLA sample, we investigate the completeness of selecting DLA absorbers based on their MgII restframe equivalent width (W ) at these redshifts. Of the 29 DLAs with clean MgII profiles, we find that six (20 per cent of DLAs) have W < 0.6 Å. The DLA incidence rate of W < 0.6Å absorbers is a factor of ~5 higher than what is seen in z ~ 1 samples, indicating a potential evolution in the MgII properties of DLAs with redshift. All of the W < 0.6Å DLAs have low metallicities (-2.5 < [M/H] < -1.7), small velocity widths (v < 50 km s), and tend to have relatively low N(H I). We demonstrate that the exclusion of these low W DLAs results in a higher mean N(H I) which in turn leads to an ~7 per cent increase in the cosmological gas density of HI of DLAs at 2 < z < 4; and that this exclusion has a minimal effect on the HI-weighted mean metallicity. © 2016 The AuthorsWe are very grateful to Sandhya Rao for her useful comments on an earlier edition of this manuscript, and sharing her results of a new Mg II survey prior to publication. We also thank the referee (Michael Murphy) for his comments for improving the manuscript. SLE acknowledges the receipt of an NSERC Discovery Grant which supported this research. JXP is supported by NSF grant AST1109447. SL has been supported by FONDECYT grant number 1140838 and partially by PFB-06 CATA. KDD is supported by an NSF AAPF fellowship awarded under NSF grant AST-1302093Oxford University PressNatural Sciences and Engineering Research Council of CanadaNational Science Foundation (US)Comisión Nacional de Investigación Científica y Tecnológica (Chile)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520172025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/376295reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1093/mnrasl/slw185Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3762952026-05-22T06:33:51Z
dc.title.none.fl_str_mv On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
title On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
spellingShingle On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
Berg, Trystyn A. M.
Galaxies: abundances
Galaxies: high-redshift
Galaxies: ISM
Quasars: absorption lines
title_short On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
title_full On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
title_fullStr On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
title_full_unstemmed On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
title_sort On the selection of damped Lyman α systems using Mg II absorption at 2 < zabs < 4
dc.creator.none.fl_str_mv Berg, Trystyn A. M.
Ellison, Sara L.
Prochaska, J. Xavier
Sánchez Ramírez, Rubén
Lopez, S.
D'Odorico, Valentina
Becker, G.
Christensen, L.
Cupani, G.
Denney, K.
Worseck, Gábor
author Berg, Trystyn A. M.
author_facet Berg, Trystyn A. M.
Ellison, Sara L.
Prochaska, J. Xavier
Sánchez Ramírez, Rubén
Lopez, S.
D'Odorico, Valentina
Becker, G.
Christensen, L.
Cupani, G.
Denney, K.
Worseck, Gábor
author_role author
author2 Ellison, Sara L.
Prochaska, J. Xavier
Sánchez Ramírez, Rubén
Lopez, S.
D'Odorico, Valentina
Becker, G.
Christensen, L.
Cupani, G.
Denney, K.
Worseck, Gábor
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Natural Sciences and Engineering Research Council of Canada
National Science Foundation (US)
Comisión Nacional de Investigación Científica y Tecnológica (Chile)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: abundances
Galaxies: high-redshift
Galaxies: ISM
Quasars: absorption lines
topic Galaxies: abundances
Galaxies: high-redshift
Galaxies: ISM
Quasars: absorption lines
description The XQ-100 survey provides optical and near-infrared coverage of 36 blindly selected, intervening damped Lyman α systems (DLAs) at 2 < z < 4, simultaneously covering the MgII doublet at λλ2796, 2803Å, and the Ly α transition. Using the XQ-100 DLA sample, we investigate the completeness of selecting DLA absorbers based on their MgII restframe equivalent width (W ) at these redshifts. Of the 29 DLAs with clean MgII profiles, we find that six (20 per cent of DLAs) have W < 0.6 Å. The DLA incidence rate of W < 0.6Å absorbers is a factor of ~5 higher than what is seen in z ~ 1 samples, indicating a potential evolution in the MgII properties of DLAs with redshift. All of the W < 0.6Å DLAs have low metallicities (-2.5 < [M/H] < -1.7), small velocity widths (v < 50 km s), and tend to have relatively low N(H I). We demonstrate that the exclusion of these low W DLAs results in a higher mean N(H I) which in turn leads to an ~7 per cent increase in the cosmological gas density of HI of DLAs at 2 < z < 4; and that this exclusion has a minimal effect on the HI-weighted mean metallicity. © 2016 The Authors
publishDate 2017
dc.date.none.fl_str_mv 2017
2025
2025
2025
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/10261/376295
url http://hdl.handle.net/10261/376295
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1093/mnrasl/slw185
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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