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dc.contributor.author
Norris, Mark A.
dc.contributor.author
Gebhardt, Karl
dc.contributor.author
Sharples, Ray M.
dc.contributor.author
Faifer, Favio Raúl
dc.contributor.author
Bridges,Terry
dc.contributor.author
Forbes, Duncan A.
dc.contributor.author
Forte, Juan Carlos
dc.contributor.author
Zepf, Stephen E.
dc.contributor.author
Beasley, Michael A.
dc.contributor.author
Hanes, David A.
dc.contributor.author
Proctor, Robert
dc.contributor.author
Kannappan, Sheila J.
dc.date.available
2017-04-10T14:02:51Z
dc.date.issued
2012-01
dc.identifier.citation
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
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/15038
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Globular Clusters
dc.subject
Dark Matter
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Eliptical Galaxies
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Halos
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
The globular cluster kinematics and galaxy dark matter content of NGC 3923
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-03-27T15:57:06Z
dc.journal.volume
421
dc.journal.number
2
dc.journal.pagination
1485-1498
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Norris, Mark A. . University Of Durham; Reino Unido
dc.description.fil
Fil: Gebhardt, Karl . University of Texas; Estados Unidos
dc.description.fil
Fil: Sharples, Ray M. . University Of Durham; Reino Unido
dc.description.fil
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
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Fil: Bridges,Terry . Queens University; Canadá
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Fil: Forbes, Duncan A. . Swinburne University; Australia
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Fil: Forte, Juan Carlos. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
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Fil: Zepf, Stephen E. . Michigan State University; Estados Unidos
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Fil: Beasley, Michael A. . Instituto de Astrofisica de Canarias; España
dc.description.fil
Fil: Hanes, David A. . Queens University; Canadá
dc.description.fil
Fil: Proctor, Robert . Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Kannappan, Sheila J.. University Of North Carolina; Estados Unidos
dc.journal.title
Monthly Notices Of The Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2012.20417.x
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/j.1365-2966.2012.20417.x
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