Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates

We present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the FS90 Antlia Group catalogue. Only 6 members of this rare type of galaxies are known until now. Using data in various photometric systems, we measured brightness and colour profiles, as well as st...

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Detalles Bibliográficos
Autores principales:	Smith Castelli, Analía Viviana, Faifer, Favio Raúl, Richtler, Tom, Bassino, Lilia Patricia
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2008
Materias:	Ciencias Astronómicas galaxies: clusters: general galaxies: clusters: individual: Antlia galaxies: dwarf galaxies: elliptical and lenticular, cD galaxies: peculiar galaxies: photometry
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/123904
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-123904
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: clusters: general galaxies: clusters: individual: Antlia galaxies: dwarf galaxies: elliptical and lenticular, cD galaxies: peculiar galaxies: photometry
spellingShingle	Ciencias Astronómicas galaxies: clusters: general galaxies: clusters: individual: Antlia galaxies: dwarf galaxies: elliptical and lenticular, cD galaxies: peculiar galaxies: photometry Smith Castelli, Analía Viviana Faifer, Favio Raúl Richtler, Tom Bassino, Lilia Patricia Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
topic_facet	Ciencias Astronómicas galaxies: clusters: general galaxies: clusters: individual: Antlia galaxies: dwarf galaxies: elliptical and lenticular, cD galaxies: peculiar galaxies: photometry
description	We present a photometric analysis of four galaxies classified as compact elliptical (cE) galaxies in the FS90 Antlia Group catalogue. Only 6 members of this rare type of galaxies are known until now. Using data in various photometric systems, we measured brightness and colour profiles, as well as structural parameters. By comparing them with those of other galaxies in the Antlia cluster, as well as with confirmed cE galaxies from the literature, we found that two of the FS90 cE candidates, albeit being spectroscopically confirmed Antlia members, are not cE galaxies. However, one of these objects presents strong ellipticity and position angle variations that resemble those already reported for M32, leading us to speculate about this kind of objects being progenitors of cE galaxies. The other two FS90 cE candidates, for which radial velocities are not available, match some features typical of cE galaxies like being close in projection to a larger galaxy, displaying flat colour profiles, and having a high degree of compactness. Only one of the remaining cE candidates shows a high central surface brightness, two components in its brightness profile, distinct changes in ellipticity and position angle where the outer component begins to dominate, and seems to follow the same trend as other confirmed cE galaxies in a luminosity versus mean effective surface brightness diagram. Moreover, it shows a distorted inner structure with similar characteristics to those found by simulations of interacting galaxies, and an extremely faint structure that seems to link this object with one of the Antlia dominant galaxies, has been detected in MOSAIC-CTIO, FORS1-VLT, and ACS-HST images. The cE nature of this galaxy as well as the possible interaction with its bright companion, still have to be confirmed through spectroscopy.
format	Articulo Articulo
author	Smith Castelli, Analía Viviana Faifer, Favio Raúl Richtler, Tom Bassino, Lilia Patricia
author_facet	Smith Castelli, Analía Viviana Faifer, Favio Raúl Richtler, Tom Bassino, Lilia Patricia
author_sort	Smith Castelli, Analía Viviana
title	Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
title_short	Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
title_full	Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
title_fullStr	Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
title_full_unstemmed	Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates
title_sort	galaxy populations in the antlia cluster : ii. compact elliptical galaxy candidates
publishDate	2008
url	http://sedici.unlp.edu.ar/handle/10915/123904
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bdutipo_str	Repositorios
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Galaxy populations in the Antlia cluster : II. Compact elliptical galaxy candidates

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