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We investigate effects of baryon dissipation on the dark matter virialscaling relation between total mass and velocity dispersion and the velocitybias of galaxies in groups and clusters using self-consistent cosmologicalsimulations. We show that the baryon dissipation increases the velocitydispersion of dark matter within the virial radius by 5% - 10%. The effect ismainly driven by the change in density and gravitational potential in innerregions of cluster, and it is larger in lower mass systems where gas coolingand star formation are more efficient. We also show that the galaxy velocitybias depends on how galaxies are selected. Galaxies selected based on theirstellar mass exhibit no velocity bias, while galaxies selected based on theirtotal mass show positive bias of ~10%, consistent with previous results basedon collisionless dark matter- only simulations. We further find thatobservational estimates of galaxy velocity dispersion are unbiased with respectto the velocity dispersion of dark matter, provided galaxies are selected usingtheir stellar masses and and their velocity dispersions are computed with morethan twenty most massive galaxies. Velocity dispersions estimated with fewergalaxies, on the other hand, can lead to significant underestimate of dynamicalmasses. Results presented in this paper should be useful in interpretatinghigh-redshift groups and clusters as well as cosmological constraints derivedfrom upcoming optical cluster surveys.

Effects of Baryon Dissipation on the Dark Matter Virial Scaling Relation