Ultracompact dwarfs around NGC 3268

We present radial velocities (from Gemini/GMOS) of the second sample of ultracompact dwarfs (UCDs) and bright globular clusters (GCs) in the Antlia cluster. 23 objects are located around the giant elliptical NGC 3268, and one is close to the fainter lenticular NGC 3273. Together with previously foun...

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Detalles Bibliográficos
Autores principales: Caso, Juan Pablo, Bassino, Lilia Patricia, Richtler, Tom, Calderón, Juan Pablo, Smith Castelli, Analía Viviana
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Ciencias Astronómicas
Galaxies: nuclei
Galaxies: photometry
Galaxies:dwarf
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85140
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85140
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: nuclei
Galaxies: photometry
Galaxies:dwarf
spellingShingle Ciencias Astronómicas
Galaxies: nuclei
Galaxies: photometry
Galaxies:dwarf
Caso, Juan Pablo
Bassino, Lilia Patricia
Richtler, Tom
Calderón, Juan Pablo
Smith Castelli, Analía Viviana
Ultracompact dwarfs around NGC 3268
topic_facet Ciencias Astronómicas
Galaxies: nuclei
Galaxies: photometry
Galaxies:dwarf
description We present radial velocities (from Gemini/GMOS) of the second sample of ultracompact dwarfs (UCDs) and bright globular clusters (GCs) in the Antlia cluster. 23 objects are located around the giant elliptical NGC 3268, and one is close to the fainter lenticular NGC 3273. Together with previously found UCDs around NGC 3258, a total of 35 UCDs and bright GCs has been now identified in the Antlia cluster. Their colours and magnitudes are compared with those of the nuclei of dE, N galaxies already confirmed as Antlia members. For a subsample that lie on ACS (Advanced Camera for Surveys) images and are brighter than M<SUB>V</SUB> = -9 mag, the effective radii (R<SUB>eff</SUB>) have been measured, the maximum radius being approximately 10 pc. In addition to the radial velocity sample, we find 10 objects in the magnitude range corresponding to GCs but with 10 < R<SUB>eff</SUB> < 17 pc, resembling the so-called extended clusters. By number and magnitude, the new UCDs fit to the GC luminosity function, supporting their interpretation as bright GCs. Additionally, we use a tracer mass estimator to calculate the mass enclosed up to ≈47 kpc from NGC 3268, which results in 2.7 × 10<SUP>12</SUP> M⊙.
format Articulo
Articulo
author Caso, Juan Pablo
Bassino, Lilia Patricia
Richtler, Tom
Calderón, Juan Pablo
Smith Castelli, Analía Viviana
author_facet Caso, Juan Pablo
Bassino, Lilia Patricia
Richtler, Tom
Calderón, Juan Pablo
Smith Castelli, Analía Viviana
author_sort Caso, Juan Pablo
title Ultracompact dwarfs around NGC 3268
title_short Ultracompact dwarfs around NGC 3268
title_full Ultracompact dwarfs around NGC 3268
title_fullStr Ultracompact dwarfs around NGC 3268
title_full_unstemmed Ultracompact dwarfs around NGC 3268
title_sort ultracompact dwarfs around ngc 3268
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85140
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AT bassinoliliapatricia ultracompactdwarfsaroundngc3268
AT richtlertom ultracompactdwarfsaroundngc3268
AT calderonjuanpablo ultracompactdwarfsaroundngc3268
AT smithcastellianaliaviviana ultracompactdwarfsaroundngc3268
bdutipo_str Repositorios
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