Peculiar motions of Abell clusters in compact groups

Details Peculiar motions of Abell clusters in compact groups Peculiar motions of Abell clusters in compact groups

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254...67r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 67-81.

Astronomy and Astrophysics

Astronomy

6

Compact Galaxies, Galactic Clusters, Red Shift, Velocity Distribution, Gravitational Effects, Hubble Constant, Spatial Distribution, Virial Theorem

Scientific paper

An estimator of the observed pair redshift velocity variance is evaluated from the observed separation vectors of Abell clusters, resolved into a component in the redshift direction, R, and the plane of the sky, T. It is found that compact groups of clusters with cluster-cluster separations about 10 Mpc each have an observed rms pair redshift velocity dispersion of about 2100 km/s, corresponding to a physical rms redshift velocity dispersion of clusters. The velocity dispersion is smaller for looser groups, and sigmav is approximately 0 for groups with cluster-cluster separations about 21 Mpc, consistent with unperturbed Hubble flow, small infall, and/or small peculiar motions.

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