Analisis de parametros estructurales de galaxias enanas en el cumulo de Antlia

JUAN PABLO CALDERÓN; LILIA P. BASSINO; SERGIO A. CELONE; ANALIA V SMITH CASTELLI; FAVIO FAIFER; JUAN PABLO CASO; TOM RICHTLER

Tafi del Valle

Encuentro; Segundas Jornadas de Astrofísica estelar; 2011

Instituto Superior de Correlación Geológica (INSUGEO) - Observatorio Astronómico de la Universidad Nacional de Córdoba (OAC)

We present an analysis of structural parameters of the population of dwarf elipitical galaxies (dE) in the Antlia cluster (d ~ 35 Mpc). The observational material includes images for four fields with the CTIO-MOSAIC camera (36´ x 36´), as well as GEMINI-GMOS spectra useful to confirm membership of a fraction of the galaxy sample.The first systematic study of the color-magnitude and luminosity-effective surface brightness relations followed by early-type galaxies in the central region of Antlia, was performed by Smith Castelli et al. (2008).In this paper we add 30 dE galaxies located in three fields adjacent to the cluster´s central one. The photometric relationships that they follow are in good agreement with those obtained by Smith Castelli et al. (2008). We study the surface brightness profiles of all dEs present in the four fields (a total of 60 galaxies), fitting Sersic models. The parameters obtained from such fits are similar to those found for other clusters of galaxies (Fornax, Coma, Virgo, Centaurus, etc).The analysis of the structural parameters of the surface brightness profiles is a tool that allows us to relate observational results with theoretical models that attempt to explain the formation and evolution of galaxies.