Galaxies in group and field environments : a comparison of optical – NIR luminosities and colors

We compare properties of galaxies in loose groups with those in fi ld environment by analyzing the Nearby Optical Galaxy (NOG) catalog of galaxy systems. We consider as group galaxies, objects belonging to systems with at least five members identified by means of the “friends of friends method ”, and, as field galaxies, all galaxies with no companions. We… (More)