Análisis de parámetros estructurales de galaxias enanas en el cúmulo de Antlia

CALDERON, J. P.; BASSINO, L. P.; CELLONE, S. A.; SMITH CASTELLI, A. V.; FAIFER, F. R.; CASO, J. P.; RICHTLER, T.

Tafí del Valle, Tucuman

Jornada; Actas de las segundas jornadas de astrofísica estelar; 2011

Observatorio Astronómico de Córdoba

We present an analysis of the structural parameters of the population ofdwarf elliptical (dE) galaxies in the Antlia cluster (approx. distance35 Mpc). The observational data include images of four fields obtainedwith the CTIO-MOSAIC camera (36'x 36'), as well as GEMINI-GMOS spectra,useful to confirm membership of a fraction of the galaxy sample.In this paper we add 30 dE galaxies located in three fields adjacent tothe cluster's central one. The photometric relationships that theyfollow are in good agreement with those obtained by Smith Castelli etal. (2008), who performed the first systematic study of thecolor-magnitude and luminosity-effective surface brightness relationsfollowed by early-type galaxies in the central region of Antlia.We study the surface brightness profiles of all dEs present in the fourfields (a total of 60 galaxies), by means of fitting Sersic models. Theparameters obtained from such fits are similar to those found for otherclusters of galaxies (Fornax, Coma, Virgo, Centaurus, etc.).The analysis of the structural parameters of the surface brightnessprofiles is a tool that allows us to relate observational results withtheoretical models that attempt to explain the formation and evolutionof galaxies.