Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-02
Mon.Not.Roy.Astron.Soc. 335 (2002) 825
Astronomy and Astrophysics
Astrophysics
3 figures replaced, accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.2002.05669.x
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 ($M_V\gsim 10^{13.5} M_{\odot}$) 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.
Dominguez Mariano J.
Lambas Diego G.
Martinez Hector J.
Merchan Manuel E.
Muriel Hernan
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