Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-03
Astron.Astrophys. 416 (2004) 441-446
Astronomy and Astrophysics
Astrophysics
6 pages, Astronomy & Astrophysics, in press
Scientific paper
10.1051/0004-6361:20031725
We analyse the Lx-sigma 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 which is consistent with that of clusters, ie., Lx ~ sigma^4. 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 in the direction of flattening the slope of the group Lx-sigma relation.
Plionis Manolis
Tovmassian Hrant
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