Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...75..241d&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 75, Feb. 1991, p. 241-271.
Astronomy and Astrophysics
Astronomy
67
Elliptical Galaxies, Galactic Clusters, Galactic Mass, Red Shift, Sky Surveys (Astronomy), Spiral Galaxies, Gravitational Effects, Histograms, Hubble Constant, Interacting Galaxies
Scientific paper
Redshift measurements, about 1000 of which are new, are presented for 1314 galaxies in a survey toward the apex of the large-scale streaming flow for ellipticals. The velocity histogram shows that the excess in galaxy number counts in this area is due to a substantial concentration of galaxies with discrete peaks at V about 3000 km/s and V about 4500 km/s. After correction for the sampling function, the centroid of the density distribution is found to be near V about 4500 km/s. Normalization to the more extensive SSRS survey, which was selected by the same criteria, shows that the region studied contains a considerable overdensity of galaxies from 2000 to 6000 km/s. This result is in good agreement with the 'great attractor' model suggested by Lynden-Bell et al. (1988) which attributes the peculiar motions of elliptical galaxies over a large region of space to an extensive mass overdensity which includes the Hydra-Centaurus and Pavo-Indus superclusters. The centroid of the density enhancement is also consistent with new data by Dressler and Faber (1990) of peculiar motions of elliptical and spiral galaxies, both of which show a zero crossing of the Hubble line at approximately 4500-5000 km/s.
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