Segregation of galaxies in groups: Dependence on magnitude gap and nearby surroundings

TAVERNA, ANTONELA; KANAGUSUKU, MARÍA JOSÉ; DIAZ GIMENEZ, EUGENIA; ZANDIVAREZ, ARIEL

Córdoba

Congreso; VI Friends-of-Friends meeting; 2016

IATE

The main aim of this work is study the morphology-density relation (MDR) and morphology-radius relation (MRR) on galaxy systems based on the iconic works of Dressler (1980) and Whitmore & Gilmore (1991). Both studies have showed that galaxy morphologies are differently distributed depending on how dense the local environment is or where is the galaxy inside the system. We also analyse the colour-density relation (CDR) and the colour-radius relation (CRR) replacing the galaxy morphology by the galaxy colour (u-r), for all the galaxies in groups and particularly for galaxies that were previously classified as spirals. We used five volume-limited samples obtained of the spectroscopic catalogue of galaxy groups built by Tempel et al.(2014). Our work is focused on analysing these indicators of segregation considering two parameters to characterise galaxy groups: the magnitude gap between the two brightest galaxiesin the group, and the nearby density surrounding the galaxy system.