DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy

Lucas Napolitano et al.

Detalles Bibliográficos
Autores: Napolitano, Lucas, Gaztañaga, Enrique, Prada, Francisco
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/399771
Acceso en línea:http://hdl.handle.net/10261/399771
https://api.elsevier.com/content/abstract/scopus_id/105008155848
Access Level:acceso abierto
Palabra clave:Quasar absorption line spectroscopy
Extragalactic astronomy
Quasars
Large-scale structure of the universe
Observational cosmology
Intergalactic gas
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network_name_str España
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dc.title.none.fl_str_mv DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
title DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
spellingShingle DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
Napolitano, Lucas
Quasar absorption line spectroscopy
Extragalactic astronomy
Quasars
Large-scale structure of the universe
Observational cosmology
Intergalactic gas
title_short DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
title_full DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
title_fullStr DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
title_full_unstemmed DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
title_sort DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift Accuracy
dc.creator.none.fl_str_mv Napolitano, Lucas
Gaztañaga, Enrique
Prada, Francisco
author Napolitano, Lucas
author_facet Napolitano, Lucas
Gaztañaga, Enrique
Prada, Francisco
author_role author
author2 Gaztañaga, Enrique
Prada, Francisco
author2_role author
author
dc.contributor.none.fl_str_mv Department of Energy (US)
National Science Foundation (US)
Science and Technology Facilities Council (UK)
Gordon and Betty Moore Foundation
Heising Simons Foundation
Commissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France)
Consejo Nacional de Humanidades, Ciencias y Tecnologías (México)
Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
Napolitano, Lucas 0000-0002-5166-8671
Gaztañaga, Enrique [0000-0001-9632-0815]
Prada, Francisco [0000-0001-7145-8674]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Quasar absorption line spectroscopy
Extragalactic astronomy
Quasars
Large-scale structure of the universe
Observational cosmology
Intergalactic gas
topic Quasar absorption line spectroscopy
Extragalactic astronomy
Quasars
Large-scale structure of the universe
Observational cosmology
Intergalactic gas
description Lucas Napolitano et al.
publishDate 2025
dc.date.none.fl_str_mv 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/10261/399771
https://api.elsevier.com/content/abstract/scopus_id/105008155848
url http://hdl.handle.net/10261/399771
https://api.elsevier.com/content/abstract/scopus_id/105008155848
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.3847/1538-3881/adc389
https://doi.org/10.3847/1538-3881/adc389
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
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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spelling DESI Mg II Absorbers: Extinction Characteristics and Quasar Redshift AccuracyNapolitano, LucasGaztañaga, EnriquePrada, FranciscoQuasar absorption line spectroscopyExtragalactic astronomyQuasarsLarge-scale structure of the universeObservational cosmologyIntergalactic gasLucas Napolitano et al.In this paper, we study how absorption-line systems affect the spectra and redshifts of quasi-stellar objects (QSOs), using catalogs of Mg ii absorbers from the early data release and first data release of the Dark Energy Spectroscopic Instrument. We determine the reddening effect of an absorption system by fitting an unreddened template spectrum to a sample of 50,674 QSO spectra that contain Mg ii absorbers. We find that reddening caused by intervening absorbers (v<inf>off</inf> > 3500 km s<sup>−1</sup>) has an average color excess of E ( B − V ) ¯ = 0.04 mag. We find that the E(B − V) tends to be greater for absorbers at low redshifts, or those having Mg ii absorption lines with higher equivalent widths, but shows no clear trend with v<inf>off</inf> for intervening systems. However, the E ( B − V ) ¯ of associated absorbers, those at v<inf>off</inf> < 3500 km s<sup>−1</sup>, shows a strong trend with v<inf>off</inf>, increasing rapidly with decreasing v<inf>off</inf> and peaking (∼0.15 mag) around v<inf>off</inf> = 0 km s<sup>−1</sup>. We demonstrate that Mg ii absorbers impact redshift estimation for QSOs by investigating the distributions of v<inf>off</inf> for associated absorbers. We find that at z > 1.5, these distributions broaden and bifurcate in a nonphysical manner. In an effort to mitigate this effect, we mask pixels associated with the Mg ii absorption lines and recalculate the QSO redshifts. We find that we can recover v<inf>off</inf> populations in better agreement with those for z < 1.5 absorbers and in doing so typically shift background QSO redshifts by Δz ≈ ± 0.005.L.N. and A.D.M. were supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Number DE-SC0019022. This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of High-Energy Physics, under Contract No. DE-AC02-05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract. Additional support for DESI was provided by the U.S. National Science Foundation (NSF), Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF’s National Optical-Infrared Astronomy Research Laboratory; the Science and Technology Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Humanities, Science and Technology of Mexico (CONAHCYT); the Ministry of Science, Innovation and Universities of Spain (MICIU/AEI/10.13039/501100011033); and by the DESI Member Institutions:  https://www.desi.lbl.gov/collaborating-institutions. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U. S. National Science Foundation, the U. S. Department of Energy, or any of the listed funding agencies.Peer reviewedIOP PublishingDepartment of Energy (US)National Science Foundation (US)Science and Technology Facilities Council (UK)Gordon and Betty Moore FoundationHeising Simons FoundationCommissariat à l'Ènergie Atomique et aux Ènergies Alternatives (France)Consejo Nacional de Humanidades, Ciencias y Tecnologías (México)Ministerio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)Napolitano, Lucas 0000-0002-5166-8671Gaztañaga, Enrique [0000-0001-9632-0815]Prada, Francisco [0000-0001-7145-8674]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/399771https://api.elsevier.com/content/abstract/scopus_id/105008155848reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.3847/1538-3881/adc389https://doi.org/10.3847/1538-3881/adc389Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3997712026-05-22T06:33:51Z
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