Spectroscopic characterization of redMaPPer galaxy clusters with DESI

Optical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in front of and behind a galaxy cluster are mistakenly associated with the primary cluster halo. These projection effects c...

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Detalles Bibliográficos
Autores: Myles, Justin|||0000-0001-6145-5859, Gruen, Daniel|||0000-0003-3270-7644, Jeltema, Tesla|||0000-0001-6089-0365, Mantz, Adam|||0000-0002-8031-1217, Allen, S., Fu, Shenming|||0000-0001-5422-1958, Pérez Ràfols, Ignasi|||0000-0001-6979-0125
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/449533
Acceso en línea:https://hdl.handle.net/2117/449533
https://dx.doi.org/10.1093/mnras/staf1831
Access Level:acceso abierto
Palabra clave:Galaxies: clusters: general
Galaxies: general
Galaxies: groups: general
Large-scale structure of Universe
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
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network_acronym_str ES
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repository_id_str
spelling Spectroscopic characterization of redMaPPer galaxy clusters with DESIMyles, Justin|||0000-0001-6145-5859Gruen, Daniel|||0000-0003-3270-7644Jeltema, Tesla|||0000-0001-6089-0365Mantz, Adam|||0000-0002-8031-1217Allen, S.Fu, Shenming|||0000-0001-5422-1958Pérez Ràfols, Ignasi|||0000-0001-6979-0125Galaxies: clusters: generalGalaxies: generalGalaxies: groups: generalLarge-scale structure of UniverseÀrees temàtiques de la UPC::Física::Astronomia i astrofísicaOptical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in front of and behind a galaxy cluster are mistakenly associated with the primary cluster halo. These projection effects caused by irreducible photometric redshift uncertainty must be quantified to facilitate the use of optical cluster catalogues. We present measurements of galaxy cluster projection effects and velocity dispersion using spectroscopy from the Dark Energy Spectroscopic Instrument. Our findings are as follows: we confirm that the fraction of redMaPPer putative member galaxies mistakenly associated with cluster haloes is richness dependent, being more than twice as large at low richness than high richness; we present the first spectroscopic evidence of an increase in projection effects with increasing redshift, by as much as 25 per cent from z = 0.1 to z = 0.2¿; moreover, we find qualitative evidence for luminosity dependence in projection effects, with fainter galaxies being more commonly far behind clusters than their bright counterparts; finally, we fit the scaling relation between measured mean spectroscopic richness and velocity dispersion, finding an implied linear scaling between spectroscopic richness and halo mass. We discuss further directions for the application of spectroscopic data sets to improve use of optically selected clusters to test cosmological models.Peer ReviewedOxford University Press20252025-10-2220252025-12-22journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/449533https://dx.doi.org/10.1093/mnras/staf1831reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4495332026-05-27T15:37:01Z
dc.title.none.fl_str_mv Spectroscopic characterization of redMaPPer galaxy clusters with DESI
title Spectroscopic characterization of redMaPPer galaxy clusters with DESI
spellingShingle Spectroscopic characterization of redMaPPer galaxy clusters with DESI
Myles, Justin|||0000-0001-6145-5859
Galaxies: clusters: general
Galaxies: general
Galaxies: groups: general
Large-scale structure of Universe
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
title_short Spectroscopic characterization of redMaPPer galaxy clusters with DESI
title_full Spectroscopic characterization of redMaPPer galaxy clusters with DESI
title_fullStr Spectroscopic characterization of redMaPPer galaxy clusters with DESI
title_full_unstemmed Spectroscopic characterization of redMaPPer galaxy clusters with DESI
title_sort Spectroscopic characterization of redMaPPer galaxy clusters with DESI
dc.creator.none.fl_str_mv Myles, Justin|||0000-0001-6145-5859
Gruen, Daniel|||0000-0003-3270-7644
Jeltema, Tesla|||0000-0001-6089-0365
Mantz, Adam|||0000-0002-8031-1217
Allen, S.
Fu, Shenming|||0000-0001-5422-1958
Pérez Ràfols, Ignasi|||0000-0001-6979-0125
author Myles, Justin|||0000-0001-6145-5859
author_facet Myles, Justin|||0000-0001-6145-5859
Gruen, Daniel|||0000-0003-3270-7644
Jeltema, Tesla|||0000-0001-6089-0365
Mantz, Adam|||0000-0002-8031-1217
Allen, S.
Fu, Shenming|||0000-0001-5422-1958
Pérez Ràfols, Ignasi|||0000-0001-6979-0125
author_role author
author2 Gruen, Daniel|||0000-0003-3270-7644
Jeltema, Tesla|||0000-0001-6089-0365
Mantz, Adam|||0000-0002-8031-1217
Allen, S.
Fu, Shenming|||0000-0001-5422-1958
Pérez Ràfols, Ignasi|||0000-0001-6979-0125
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Galaxies: clusters: general
Galaxies: general
Galaxies: groups: general
Large-scale structure of Universe
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
topic Galaxies: clusters: general
Galaxies: general
Galaxies: groups: general
Large-scale structure of Universe
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
description Optical galaxy cluster identification algorithms such as redMaPPer promise to enable an array of astrophysical and cosmological studies, but suffer from biases whereby galaxies in front of and behind a galaxy cluster are mistakenly associated with the primary cluster halo. These projection effects caused by irreducible photometric redshift uncertainty must be quantified to facilitate the use of optical cluster catalogues. We present measurements of galaxy cluster projection effects and velocity dispersion using spectroscopy from the Dark Energy Spectroscopic Instrument. Our findings are as follows: we confirm that the fraction of redMaPPer putative member galaxies mistakenly associated with cluster haloes is richness dependent, being more than twice as large at low richness than high richness; we present the first spectroscopic evidence of an increase in projection effects with increasing redshift, by as much as 25 per cent from z = 0.1 to z = 0.2¿; moreover, we find qualitative evidence for luminosity dependence in projection effects, with fainter galaxies being more commonly far behind clusters than their bright counterparts; finally, we fit the scaling relation between measured mean spectroscopic richness and velocity dispersion, finding an implied linear scaling between spectroscopic richness and halo mass. We discuss further directions for the application of spectroscopic data sets to improve use of optically selected clusters to test cosmological models.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-10-22
2025
2025-12-22
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/449533
https://dx.doi.org/10.1093/mnras/staf1831
url https://hdl.handle.net/2117/449533
https://dx.doi.org/10.1093/mnras/staf1831
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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