Galaxy groups in the 2dF redshift survey: Galaxy Spectral Type Segregation in Groups

M.J. DOMINGUEZ; A.A. ZANDIVAREZ; H.J. MARTINEZ; M.E. MERCHAN; H. MURIEL; D.G. LAMBAS

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Año: 2002 p. 825 - 830

0035-8711

The behaviour of the relative fraction of galaxies with different spectral types in groups is analysed as a function of projected local galaxy density and the group-centric distance. The group sample was taken from the 2dF Group Galaxy Calatogue constructed by Merch´an & Zandivarez. Our group sample was constrained to have a homogeneous virial mass distribution with redshift. Galaxies belonging to this group sample were selected in order to minimize possible biases such as preferential selection of high luminosity objects. We find a clear distinction between high virial mass groups ($M_Vgsim 10^{13.5} M_{odot}$) and the less massive ones. While the massive groups show a significant dependence of the relative fraction of low star formation galaxies on local galaxy density and group-centric radius,groups with lower masses show no significant trends. We also cross-correlate our group subsample with the previously identified clusters finding that this sample shows a very similar behaviour as observed in the high virial mass group subsample.