Fotometria superficial de galaxias de tipo temprano en las regiones externas del cumulo de Antlia

J.P. CALDERON, L.P. BASSINO, A.V. SMITH CASTELLI, S.A. CELLONE

Salta

Congreso; 53a. Reunion de la Asociacion Argentina de Astronomia; 2010

Asociacion Argentina de Astronomia

We present surface photometry of 30 early-type galaxies in the Antlia cluster, and analyze their color-magnitude and surface brightness - luminosity relations. The photometric relations are consistent, in the range corresponding to low luminosities, with those obtained in previous papers for galaxies lying in the central Antlia region. The projected spatial distribution confirms the elongated structure followed by other Antlia galaxies as well as globular clusters, in the direction that connects the more massive galaxies. In addition, surface brightness profiles have been measured for a sub-sample using the task ELLIPSE within IRAF. We are currently fitting S´ersic models to these profiles, in order to quantify the morphology of the studied galaxies.