Distances to five nearby southern galaxy clusters and the absolute motion of the Local Group

Details Distances to five nearby southern galaxy clusters and the absolute motion of the Local Group Distances to five nearby southern galaxy clusters and the absolute motion of the Local Group

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235.1177l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Dec. 15, 1988, p. 1177-1201. Research supported by

Astronomy and Astrophysics

Astronomy

129

Astrometry, Galactic Clusters, Local Group (Astronomy), Distance, Red Shift

Scientific paper

The authors present redshifts and central velocity dispersions for galaxies in five nearby southern clusters, Abell 194 (0122-02), Hydra (Abell 1060, 1034-27), Centaurus (1246-41), Pavo II (1842-63) and Klemola 44 (2345-28). Relative distances to these galaxy clusters are derived via the application of the D-σ relation to the early-type galaxies. The authors find that the rich clusters in their sample have peculiar velocities with respect to the cosmic microwave background (CMB) that are not significantly different from zero. This includes Cen 30 for which they find a peculiar motion of only ≡200±300 km s-1. Thus this work disagrees with the claim made by Lynden-Bell et al., that Cen 30 possesses a large peculiar velocity. The idea of a "Great Attractor" lying beyond the Hydra-Centaurus supercluster is not supported. However, the Centaurus and Hydra clusters themselves will clearly be major attractors in this region. The authors derive a motion for the Local Group with respect to this frame of distant rich clusters that is in good agreement with that inferred from the CMB dipole. They find that rich clusters have only small motions with respect to the CMB.

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