Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images

We have conducted a NIR study of the environments of seven radio-loud quasars at redshifts 1 < z < 1.6. In present paper we describe deep K band images obtained for the fields of ∼ 6 × 6 arcmin around the quasars with 3σ limiting magnitudes of K ∼ 20.5. These fields were previously studied usi...

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Detalles Bibliográficos
Autores: Sánchez, Sebastián F., González-Serrano, José Ignacio
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2002
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/385613
Acceso en línea:http://hdl.handle.net/10261/385613
Access Level:acceso abierto
Palabra clave:Galaxies: clusters: general
Radio continuum: galaxies
Quasars: general
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spelling Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band imagesSánchez, Sebastián F.González-Serrano, José IgnacioGalaxies: clusters: generalRadio continuum: galaxiesQuasars: generalWe have conducted a NIR study of the environments of seven radio-loud quasars at redshifts 1 < z < 1.6. In present paper we describe deep K band images obtained for the fields of ∼ 6 × 6 arcmin around the quasars with 3σ limiting magnitudes of K ∼ 20.5. These fields were previously studied using deep B and R band images (Sanchez & Gonzalez-Serrano 1999). Using optical and NIR data together, a significant excess of galaxies has been found whose optical-NIR colours, luminosity, spatial scale, and number of galaxies are compatible with clusters at the redshift of the quasar. We have selected a sample of cluster candidates analyzing the R − K vs. K diagram. A ∼25% of the candidates present red optical-NIR colours and an ultraviolet excess. This population has been also found in clusters around quasars at the same redshifts (Tanaka et al. 2000; Haines et al. 2001). These galaxies seem to follow a mixed evolution: a main passive evolution plus late star formation processes. The quasars do not inhabit the core of the clusters, being found in the outer regions. This result agrees with the hypothesis that the origin/feeding mechanism of the nuclear activity is merging processes. The quasars inhabit the region where a collision is most likely to produce a merger.J. I. Gonzalez-Serrano wants to aknowledge financial support from DGESIC (Ministerio de Educacion y Cultura) under project PB98-0409-C02-02.Peer reviewedEDP SciencesDirección General de Enseñanza Superior e Investigación Científica (España)Ministerio de Educación y Cultura (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252002info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/385613reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1051/0004-6361:20021455Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3856132026-05-22T06:33:51Z
dc.title.none.fl_str_mv Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
title Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
spellingShingle Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
Sánchez, Sebastián F.
Galaxies: clusters: general
Radio continuum: galaxies
Quasars: general
title_short Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
title_full Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
title_fullStr Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
title_full_unstemmed Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
title_sort Cluster of galaxies around seven radio-loud QSOs at 1 < z < 1:6 II. K-band images
dc.creator.none.fl_str_mv Sánchez, Sebastián F.
González-Serrano, José Ignacio
author Sánchez, Sebastián F.
author_facet Sánchez, Sebastián F.
González-Serrano, José Ignacio
author_role author
author2 González-Serrano, José Ignacio
author2_role author
dc.contributor.none.fl_str_mv Dirección General de Enseñanza Superior e Investigación Científica (España)
Ministerio de Educación y Cultura (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: clusters: general
Radio continuum: galaxies
Quasars: general
topic Galaxies: clusters: general
Radio continuum: galaxies
Quasars: general
description We have conducted a NIR study of the environments of seven radio-loud quasars at redshifts 1 < z < 1.6. In present paper we describe deep K band images obtained for the fields of ∼ 6 × 6 arcmin around the quasars with 3σ limiting magnitudes of K ∼ 20.5. These fields were previously studied using deep B and R band images (Sanchez & Gonzalez-Serrano 1999). Using optical and NIR data together, a significant excess of galaxies has been found whose optical-NIR colours, luminosity, spatial scale, and number of galaxies are compatible with clusters at the redshift of the quasar. We have selected a sample of cluster candidates analyzing the R − K vs. K diagram. A ∼25% of the candidates present red optical-NIR colours and an ultraviolet excess. This population has been also found in clusters around quasars at the same redshifts (Tanaka et al. 2000; Haines et al. 2001). These galaxies seem to follow a mixed evolution: a main passive evolution plus late star formation processes. The quasars do not inhabit the core of the clusters, being found in the outer regions. This result agrees with the hypothesis that the origin/feeding mechanism of the nuclear activity is merging processes. The quasars inhabit the region where a collision is most likely to produce a merger.
publishDate 2002
dc.date.none.fl_str_mv 2002
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/10261/385613
url http://hdl.handle.net/10261/385613
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1051/0004-6361:20021455
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 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)
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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