PHOTOMETRIC CLASSIFICATION OF GALAXY GROUPS

A, GONZALEZ; J, ALACORIA; R, TAPIA VEGA; M, S, ALONSO; D, G, LAMBAS

Pucón, Chile

Congreso; Third International Meeting of Dynamic Astronomy in Latin America; 2006

Instituto Milenio de Astrofísica, Fondo GEMINI-CONICYT, CCJCA-CASSACA, UMI-FCA CNRS, PUC-VRI, ESO, LCO-GMT NAOJ, CONICYT-PCI, DECyTI Minrel, AURA-O

We present a photometricclassification of galaxy groups obtained by Merchan & Zandivarez (2005)from the Third Data Release of the Sloan Digital Sky Survey (SDSS-DR3). Wedivide the groups into Equal(E), Binary(B) and Central Dominant (cD) systems bycomparing r-band member galaxy magnitudes. cD groups contain one galaxy in thecenter with higher luminosity than the rest of the members, B groups have twocentral luminosity galaxies while in E groups all galaxies have a comparableluminosity. The number of members in the groups have a range between 6 and10members.