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...

Descripción completa

Detalles Bibliográficos
Autores principales: Caso, Juan Pablo, Richtler, Thomas, Bassino, Lilia Patricia, Salinas, R., Lane, R. R., Romanowsky, A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85700
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85700
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
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
spellingShingle Ciencias Astronómicas
Clusters
Elliptical and lenticular, cD-Galaxies
Galaxies
General
Individual
NGC 7507-Galaxies
Star clusters
Caso, Juan Pablo
Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
The paucity of globular clusters around the field elliptical NGC 7507
topic_facet 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.
format Articulo
Articulo
author Caso, Juan Pablo
Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
author_facet Caso, Juan Pablo
Richtler, Thomas
Bassino, Lilia Patricia
Salinas, R.
Lane, R. R.
Romanowsky, A.
author_sort Caso, Juan Pablo
title The paucity of globular clusters around the field elliptical NGC 7507
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 paucity of globular clusters around the field elliptical ngc 7507
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85700
work_keys_str_mv AT casojuanpablo thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT richtlerthomas thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT bassinoliliapatricia thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT salinasr thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT lanerr thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT romanowskya thepaucityofglobularclustersaroundthefieldellipticalngc7507
AT casojuanpablo paucityofglobularclustersaroundthefieldellipticalngc7507
AT richtlerthomas paucityofglobularclustersaroundthefieldellipticalngc7507
AT bassinoliliapatricia paucityofglobularclustersaroundthefieldellipticalngc7507
AT salinasr paucityofglobularclustersaroundthefieldellipticalngc7507
AT lanerr paucityofglobularclustersaroundthefieldellipticalngc7507
AT romanowskya paucityofglobularclustersaroundthefieldellipticalngc7507
bdutipo_str Repositorios
_version_ 1764820489647161346

Ejemplares similares