The globular cluster kinematics and galaxy dark matter content of NGC 3923

Autores
Norris, Mark A.; Gebhardt, Karl; Sharples, Ray M.; Faifer, Favio Raúl; Bridges,Terry; Forbes, Duncan A.; Forte, Juan Carlos; Zepf, Stephen E.; Beasley, Michael A.; Hanes, David A.; Proctor, Robert; Kannappan, Sheila J.
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
This paper presents further results from our spectroscopic study of the globular cluster (GC) system of the group elliptical NGC 3923. From observations made with the GMOS instrument on the Gemini South telescope, an additional 50 GC and Ultra Compact Dwarf (UCD) candidates have been spectroscopically confirmed as members of the NGC 3923 system. When the recessional velocities of these GCs are combined with the 29 GC velocities reported previously, a total sample of 79 GC/UCD velocities is produced. This sample extends to over 6 arcmin (>6 Re ∼30 kpc) from the centre of NGC 3923, and is used to study the dynamics of the GC system and the dark matter content of NGC 3923. It is found that the GC system of NGC 3923 displays no appreciable rotation, and that the projected velocity dispersion is constant with radius within the uncertainties. The velocity dispersion profiles of the integrated light and GC system of NGC 3923 are indistinguishable over the region in which they overlap. We find some evidence that the diffuse light and GCs of NGC 3923 have radially biased orbits within ∼130′′. The application of axisymmetric orbit-based models to the GC and integrated light velocity dispersion profiles demonstrates that a significant increase in the mass-to-light ratio (from M/LV = 8 to 26) at large galactocentric radii is required to explain this observation. We therefore confirm the presence of a dark matter halo in NGC 3923. We find that dark matter comprises 17.5+7.3 −4.5% of the mass within 1 Re, 41.2+18.2 −10.6% within 2 Re, and 75.6+15.4 −16.8% within the radius of our last kinematic tracer at 6.9 Re. The total dynamical mass within this radius is found to be 1.5+0.4 −0.25×1012 M⊙. In common with other studies of large ellipticals, we find that our derived dynamical mass profile is consistently higher than that derived by X-ray observations, by a factor of around 2.
Fil: Norris, Mark A. . University Of Durham; Reino Unido
Fil: Gebhardt, Karl . University of Texas; Estados Unidos
Fil: Sharples, Ray M. . University Of Durham; Reino Unido
Fil: Faifer, Favio Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Bridges,Terry . Queens University; Canadá
Fil: Forbes, Duncan A. . Swinburne University; Australia
Fil: Forte, Juan Carlos. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Zepf, Stephen E. . Michigan State University; Estados Unidos
Fil: Beasley, Michael A. . Instituto de Astrofisica de Canarias; España
Fil: Hanes, David A. . Queens University; Canadá
Fil: Proctor, Robert . Universidade de Sao Paulo; Brasil
Fil: Kannappan, Sheila J.. University Of North Carolina; Estados Unidos
Materia
Globular clusters
Dark Matter
Eliptical galaxies
Halos
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/15038
Acceder
id CONICETDig_d939572404f0bdb626758ac35371044b
oai_identifier_str oai:ri.conicet.gov.ar:11336/15038
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling The globular cluster kinematics and galaxy dark matter content of NGC 3923Norris, Mark A. Gebhardt, Karl Sharples, Ray M. Faifer, Favio RaúlBridges,Terry Forbes, Duncan A. Forte, Juan CarlosZepf, Stephen E. Beasley, Michael A. Hanes, David A. Proctor, Robert Kannappan, Sheila J.Globular clustersDark MatterEliptical galaxiesHaloshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1This paper presents further results from our spectroscopic study of the globular cluster (GC) system of the group elliptical NGC 3923. From observations made with the GMOS instrument on the Gemini South telescope, an additional 50 GC and Ultra Compact Dwarf (UCD) candidates have been spectroscopically confirmed as members of the NGC 3923 system. When the recessional velocities of these GCs are combined with the 29 GC velocities reported previously, a total sample of 79 GC/UCD velocities is produced. This sample extends to over 6 arcmin (>6 Re ∼30 kpc) from the centre of NGC 3923, and is used to study the dynamics of the GC system and the dark matter content of NGC 3923. It is found that the GC system of NGC 3923 displays no appreciable rotation, and that the projected velocity dispersion is constant with radius within the uncertainties. The velocity dispersion profiles of the integrated light and GC system of NGC 3923 are indistinguishable over the region in which they overlap. We find some evidence that the diffuse light and GCs of NGC 3923 have radially biased orbits within ∼130′′. The application of axisymmetric orbit-based models to the GC and integrated light velocity dispersion profiles demonstrates that a significant increase in the mass-to-light ratio (from M/LV = 8 to 26) at large galactocentric radii is required to explain this observation. We therefore confirm the presence of a dark matter halo in NGC 3923. We find that dark matter comprises 17.5+7.3 −4.5% of the mass within 1 Re, 41.2+18.2 −10.6% within 2 Re, and 75.6+15.4 −16.8% within the radius of our last kinematic tracer at 6.9 Re. The total dynamical mass within this radius is found to be 1.5+0.4 −0.25×1012 M⊙. In common with other studies of large ellipticals, we find that our derived dynamical mass profile is consistently higher than that derived by X-ray observations, by a factor of around 2.Fil: Norris, Mark A. . University Of Durham; Reino UnidoFil: Gebhardt, Karl . University of Texas; Estados UnidosFil: Sharples, Ray M. . University Of Durham; Reino UnidoFil: Faifer, Favio Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Bridges,Terry . Queens University; CanadáFil: Forbes, Duncan A. . Swinburne University; AustraliaFil: Forte, Juan Carlos. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaFil: Zepf, Stephen E. . Michigan State University; Estados UnidosFil: Beasley, Michael A. . Instituto de Astrofisica de Canarias; EspañaFil: Hanes, David A. . Queens University; CanadáFil: Proctor, Robert . Universidade de Sao Paulo; BrasilFil: Kannappan, Sheila J.. University Of North Carolina; Estados UnidosWiley2012-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/15038Norris, Mark A. ; Gebhardt, Karl ; Sharples, Ray M. ; Faifer, Favio Raúl; Bridges,Terry ; et al.; The globular cluster kinematics and galaxy dark matter content of NGC 3923; Wiley; Monthly Notices Of The Royal Astronomical Society; 421; 2; 1-2012; 1485-14980035-8711enginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2012.20417.xinfo:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.20417.xinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:01:24Zoai:ri.conicet.gov.ar:11336/15038instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:01:25.119CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The globular cluster kinematics and galaxy dark matter content of NGC 3923
title The globular cluster kinematics and galaxy dark matter content of NGC 3923
spellingShingle The globular cluster kinematics and galaxy dark matter content of NGC 3923
Norris, Mark A.
Globular clusters
Dark Matter
Eliptical galaxies
Halos
title_short The globular cluster kinematics and galaxy dark matter content of NGC 3923
title_full The globular cluster kinematics and galaxy dark matter content of NGC 3923
title_fullStr The globular cluster kinematics and galaxy dark matter content of NGC 3923
title_full_unstemmed The globular cluster kinematics and galaxy dark matter content of NGC 3923
title_sort The globular cluster kinematics and galaxy dark matter content of NGC 3923
dc.creator.none.fl_str_mv Norris, Mark A.
Gebhardt, Karl
Sharples, Ray M.
Faifer, Favio Raúl
Bridges,Terry
Forbes, Duncan A.
Forte, Juan Carlos
Zepf, Stephen E.
Beasley, Michael A.
Hanes, David A.
Proctor, Robert
Kannappan, Sheila J.
author Norris, Mark A.
author_facet Norris, Mark A.
Gebhardt, Karl
Sharples, Ray M.
Faifer, Favio Raúl
Bridges,Terry
Forbes, Duncan A.
Forte, Juan Carlos
Zepf, Stephen E.
Beasley, Michael A.
Hanes, David A.
Proctor, Robert
Kannappan, Sheila J.
author_role author
author2 Gebhardt, Karl
Sharples, Ray M.
Faifer, Favio Raúl
Bridges,Terry
Forbes, Duncan A.
Forte, Juan Carlos
Zepf, Stephen E.
Beasley, Michael A.
Hanes, David A.
Proctor, Robert
Kannappan, Sheila J.
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Globular clusters
Dark Matter
Eliptical galaxies
Halos
topic Globular clusters
Dark Matter
Eliptical galaxies
Halos
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv This paper presents further results from our spectroscopic study of the globular cluster (GC) system of the group elliptical NGC 3923. From observations made with the GMOS instrument on the Gemini South telescope, an additional 50 GC and Ultra Compact Dwarf (UCD) candidates have been spectroscopically confirmed as members of the NGC 3923 system. When the recessional velocities of these GCs are combined with the 29 GC velocities reported previously, a total sample of 79 GC/UCD velocities is produced. This sample extends to over 6 arcmin (>6 Re ∼30 kpc) from the centre of NGC 3923, and is used to study the dynamics of the GC system and the dark matter content of NGC 3923. It is found that the GC system of NGC 3923 displays no appreciable rotation, and that the projected velocity dispersion is constant with radius within the uncertainties. The velocity dispersion profiles of the integrated light and GC system of NGC 3923 are indistinguishable over the region in which they overlap. We find some evidence that the diffuse light and GCs of NGC 3923 have radially biased orbits within ∼130′′. The application of axisymmetric orbit-based models to the GC and integrated light velocity dispersion profiles demonstrates that a significant increase in the mass-to-light ratio (from M/LV = 8 to 26) at large galactocentric radii is required to explain this observation. We therefore confirm the presence of a dark matter halo in NGC 3923. We find that dark matter comprises 17.5+7.3 −4.5% of the mass within 1 Re, 41.2+18.2 −10.6% within 2 Re, and 75.6+15.4 −16.8% within the radius of our last kinematic tracer at 6.9 Re. The total dynamical mass within this radius is found to be 1.5+0.4 −0.25×1012 M⊙. In common with other studies of large ellipticals, we find that our derived dynamical mass profile is consistently higher than that derived by X-ray observations, by a factor of around 2.
Fil: Norris, Mark A. . University Of Durham; Reino Unido
Fil: Gebhardt, Karl . University of Texas; Estados Unidos
Fil: Sharples, Ray M. . University Of Durham; Reino Unido
Fil: Faifer, Favio Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Bridges,Terry . Queens University; Canadá
Fil: Forbes, Duncan A. . Swinburne University; Australia
Fil: Forte, Juan Carlos. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Fil: Zepf, Stephen E. . Michigan State University; Estados Unidos
Fil: Beasley, Michael A. . Instituto de Astrofisica de Canarias; España
Fil: Hanes, David A. . Queens University; Canadá
Fil: Proctor, Robert . Universidade de Sao Paulo; Brasil
Fil: Kannappan, Sheila J.. University Of North Carolina; Estados Unidos
description This paper presents further results from our spectroscopic study of the globular cluster (GC) system of the group elliptical NGC 3923. From observations made with the GMOS instrument on the Gemini South telescope, an additional 50 GC and Ultra Compact Dwarf (UCD) candidates have been spectroscopically confirmed as members of the NGC 3923 system. When the recessional velocities of these GCs are combined with the 29 GC velocities reported previously, a total sample of 79 GC/UCD velocities is produced. This sample extends to over 6 arcmin (>6 Re ∼30 kpc) from the centre of NGC 3923, and is used to study the dynamics of the GC system and the dark matter content of NGC 3923. It is found that the GC system of NGC 3923 displays no appreciable rotation, and that the projected velocity dispersion is constant with radius within the uncertainties. The velocity dispersion profiles of the integrated light and GC system of NGC 3923 are indistinguishable over the region in which they overlap. We find some evidence that the diffuse light and GCs of NGC 3923 have radially biased orbits within ∼130′′. The application of axisymmetric orbit-based models to the GC and integrated light velocity dispersion profiles demonstrates that a significant increase in the mass-to-light ratio (from M/LV = 8 to 26) at large galactocentric radii is required to explain this observation. We therefore confirm the presence of a dark matter halo in NGC 3923. We find that dark matter comprises 17.5+7.3 −4.5% of the mass within 1 Re, 41.2+18.2 −10.6% within 2 Re, and 75.6+15.4 −16.8% within the radius of our last kinematic tracer at 6.9 Re. The total dynamical mass within this radius is found to be 1.5+0.4 −0.25×1012 M⊙. In common with other studies of large ellipticals, we find that our derived dynamical mass profile is consistently higher than that derived by X-ray observations, by a factor of around 2.
publishDate 2012
dc.date.none.fl_str_mv 2012-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/15038
Norris, Mark A. ; Gebhardt, Karl ; Sharples, Ray M. ; Faifer, Favio Raúl; Bridges,Terry ; et al.; The globular cluster kinematics and galaxy dark matter content of NGC 3923; Wiley; Monthly Notices Of The Royal Astronomical Society; 421; 2; 1-2012; 1485-1498
0035-8711
url http://hdl.handle.net/11336/15038
identifier_str_mv Norris, Mark A. ; Gebhardt, Karl ; Sharples, Ray M. ; Faifer, Favio Raúl; Bridges,Terry ; et al.; The globular cluster kinematics and galaxy dark matter content of NGC 3923; Wiley; Monthly Notices Of The Royal Astronomical Society; 421; 2; 1-2012; 1485-1498
0035-8711
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2012.20417.x
info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2966.2012.20417.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley
publisher.none.fl_str_mv Wiley
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 12.982451

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