Other
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phys...21..630t&link_type=abstract
(University of Copenhagen, Danish Research Council and Nordisk Institut for Teoretisk Atomfysik, Copenhagen Symposium on the Uni
Other
22
Galactic Clusters, Galaxies, Hubble Diagram, Radial Velocity, Velocity Measurement, Cosmology, Evolution (Development), Isotropy, Milky Way Galaxy, Virgo Galactic Cluster
Scientific paper
The peculiar random or streaming motions of field galaxies and groups of galaxies relative to an ideal Hubble flow are investigated. Motions within the Local Group are discussed and compared with those of other groups of galaxies, and the peculiar motions of field galaxies and of groups of galaxies taken as units are considered. It is found that for galaxies and groups of galaxies with expansion velocities less than 1000 km/sec, the mean radial velocity dispersion is less than 100 km/sec and probably less than 50 km/sec. Examination of the motion of the Local Group towards the Virgo cluster reveals a non-Hubble infall velocity between 100 and 250 km/sec. Various tests for galaxies with velocities above 1000 km/sec also show the Hubble motion to be isotropic to within less than 10%. It is concluded that if large (greater than 300 km/sec) systematic motions of the Local Group are found with respect to a distant frame of reference, they must encompass a very large comoving volume.
Sandage Alan
Tammann Gustav A.
Yahil Amos
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