On the dynamics of the cores of galaxy clusters.

Details On the dynamics of the cores of galaxy clusters. On the dynamics of the cores of galaxy clusters.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..349d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 279, No. 2, p. 349 - 388

Astronomy and Astrophysics

Astronomy

120

Galaxies: Clusters: General -- Galaxies: Kinematics And Dynamics -- Cosmology: Observations -- Dark Matter, Clusters Of Galaxies: Velocity Dispersion, Clusters Of Galaxies: Dynamics

Scientific paper

The authors have determined the radial velocity-dispersion profiles (VDPs) of 72 clusters, each with over 50 confirmed members. The velocity dispersion σV in clusters is found to be a strong function of radius; the largest gradients generally occur in the inner 0.5 h-1Mpc. In 27 clusters the VDP is significantly centrally peaked, while in 11 cases the authors find an "inverted" profile, i.e. σV increases with distance from the centre in the inner 0.5 h-1Mpc. In four other clusters, whose VDPs were unclassifiable, the authors find hints of a central inversion of σV. Several tests indicate that the observed fractions of peaked and inverted VDPs cannot be explained as the result of noise in the data alone. It is possible to reproduce most of the global features of the VDPs with semi-analytical spherical models.

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