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2010MNRAS.408.2442W - Mon. Not. R. Astron. Soc., 408, 2442-2456 (2010/November-2)
Mass profiles and galaxy orbits in nearby galaxy clusters from the analysis of the projected phase space.
WOJTAK R. and LOKAS E.L.
Abstract (from CDS):
We show that galaxy orbits are isotropic at the cluster centres (with the mean ratio of the radial-to-tangential velocity dispersions σr/σθ= 0.97±0.04) and radially anisotropic at the virial sphere (with the mean ratio σr/σθ= 1.75+0.23–0.19). Although the value of the central anisotropy appears to be universal, the anisotropy at the virial radius differs between clusters within the range 1 ≲ (σ_r/σθ_) ≲ 2.
Utilizing the Bautz-Morgan morphological classification and information on the prominence of a cool core we select two subsamples of galaxy clusters corresponding to less and more advanced evolutionary states. It is demonstrated that less evolved clusters have shallower mass profiles and their galaxy orbits are more radially biased at the virial sphere. This property is consistent with the expected evolution of the mass profiles as well as with the observed orbital segregation of late- and early-type galaxies.
Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: kinematics and dynamics - dark matter
Simbad objects: 46
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