On the L relation of groups of galaxies
Institute of Astronomy & Astrophysics, National Observatory of Athens, I. Metaxa & B. Pavlou, P. Penteli 152 36, Athens, Greece e-mail: email@example.com
2 Instituto Nacional de Astrofísica Óptica y Electrónica, AP 51 y 216, 72000, Puebla, Pue, México
Corresponding author: H. M. Tovmassian, firstname.lastname@example.org
Accepted: 6 November 2003
We analyse the relation for the new Mulchaey et al. group Atlas. We find that once we take into account the possible statistical bias introduced by the cutoff in luminosity, we recover a relation that is consistent with that of clusters, i.e., . The larger scatter of this relation for groups of galaxies could be attributed to an orientation effect, due to which the radial velocity dispersion of groups oriented close to orthogonal to the line of sight, would be underestimated. This effect could also contribute to flattening the slope of the group relation.
Key words: galaxies: clusters: general / X-rays: galaxies
© ESO, 2004