On the Xray Luminosity - velocity dispersion relation of groups of galaxies

Details On the Xray Luminosity - velocity dispersion relation of groups of galaxies On the Xray Luminosity - velocity dispersion relation of groups of galaxies

2003-11-03

arxiv.org/abs/astro-ph/0311051v1

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.

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