The paucity of globular clusters around the field elliptical NGC 7507

Context. There is strong evidence that globular cluster systems (GCSs) of massive galaxies are largely assembled by infall/accretion processes. Therefore, we expect the GCSs of isolated elliptical galaxies to be poor. Although not completely isolated, NGC 7507 is a massive field elliptical galaxy wi...

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Detalles Bibliográficos
Autores: Caso, Juan Pablo, Richtler, Thomas, Bassino, Lilia Patricia, Salinas, R., Lane, R. R., Romanowsky, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/85700
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85700
Access Level:acceso abierto
Palabra clave:Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
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repository_id_str
spelling The paucity of globular clusters around the field elliptical NGC 7507Caso, Juan PabloRichtler, ThomasBassino, Lilia PatriciaSalinas, R.Lane, R. R.Romanowsky, A.Ciencias AstronómicasClustersElliptical and lenticular, cD-GalaxiesGalaxiesGeneralIndividualNGC 7507-GalaxiesStar clustersContext. There is strong evidence that globular cluster systems (GCSs) of massive galaxies are largely assembled by infall/accretion processes. Therefore, we expect the GCSs of isolated elliptical galaxies to be poor. Although not completely isolated, NGC 7507 is a massive field elliptical galaxy with an apparently very low dark matter content. Aims. We determine the richness, the colour distribution, and the structural properties of the GCS of NGC 7507. Methods. We performed wide-field Washington photometry with data obtained with the MOSAIC II camera at the 4m-Blanco telescope (CTIO, Chile). Results. The GCS is very poor with SN ≈ 0.6. We identify three subpopulations with peaks at (C - T1) colours of 1.21, 1.42, and 1.72. The bluest population may represent the old, metal-poor component. This interpretation is supported by its shallow density profile. The red population is more concentrated, resembling the galaxy light. The intermediate-colour population is strongly peaked in colour, and we interpret this population as the signature of a starburst whose age depends on the metallicity, but should be quite old, since no signatures of a merger are identifiable. In addition, we find a main sequence in the stellar foreground population, which we attribute to the Sagittarius dwarf tidal stream. Conclusions. The extrordinarily poor GCS of NGC 7507, a massive elliptical galaxy, is an illustration of how important the environmental conditions are for producing rich GCSs.Instituto de Astrofísica de La PlataFacultad de Ciencias Astronómicas y Geofísicas2013info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/85700enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201321032info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2024-05-08T12:54:31Zoai:sedici.unlp.edu.ar:10915/85700Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 12:54:32.075SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The paucity of globular clusters around the field elliptical NGC 7507
title The paucity of globular clusters around the field elliptical NGC 7507
spellingShingle The paucity of globular clusters around the field elliptical NGC 7507
Caso, Juan Pablo
Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
title_short The paucity of globular clusters around the field elliptical NGC 7507
title_full The paucity of globular clusters around the field elliptical NGC 7507
title_fullStr The paucity of globular clusters around the field elliptical NGC 7507
title_full_unstemmed The paucity of globular clusters around the field elliptical NGC 7507
title_sort The paucity of globular clusters around the field elliptical NGC 7507
dc.creator.none.fl_str_mv Caso, Juan Pablo
Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
author Caso, Juan Pablo
author_facet Caso, Juan Pablo
Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
author_role author
author2 Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
topic Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
description Context. There is strong evidence that globular cluster systems (GCSs) of massive galaxies are largely assembled by infall/accretion processes. Therefore, we expect the GCSs of isolated elliptical galaxies to be poor. Although not completely isolated, NGC 7507 is a massive field elliptical galaxy with an apparently very low dark matter content. Aims. We determine the richness, the colour distribution, and the structural properties of the GCS of NGC 7507. Methods. We performed wide-field Washington photometry with data obtained with the MOSAIC II camera at the 4m-Blanco telescope (CTIO, Chile). Results. The GCS is very poor with SN ≈ 0.6. We identify three subpopulations with peaks at (C - T1) colours of 1.21, 1.42, and 1.72. The bluest population may represent the old, metal-poor component. This interpretation is supported by its shallow density profile. The red population is more concentrated, resembling the galaxy light. The intermediate-colour population is strongly peaked in colour, and we interpret this population as the signature of a starburst whose age depends on the metallicity, but should be quite old, since no signatures of a merger are identifiable. In addition, we find a main sequence in the stellar foreground population, which we attribute to the Sagittarius dwarf tidal stream. Conclusions. The extrordinarily poor GCS of NGC 7507, a massive elliptical galaxy, is an illustration of how important the environmental conditions are for producing rich GCSs.
publishDate 2013
dc.date.none.fl_str_mv 2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/85700
url http://sedici.unlp.edu.ar/handle/10915/85700
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201321032
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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