The local extragalactic velocity field as a test of the explosion and gravitational instability pictures

Details The local extragalactic velocity field as a test of the explosion and gravitational instability pictures The local extragalactic velocity field as a test of the explosion and gravitational instability pictures

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332...17p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 17-25. NSF-supported research.

Mathematics

29

Cosmology, Galactic Clusters, Galactic Evolution, Microwaves, Red Shift, Virgo Galactic Cluster, Covariance, H Lines, Matrices (Mathematics), Stellar Motions

Scientific paper

The local velocity field derived from the Aaronson et al. catalog of galaxy infrared magnitudes and H I line widths is used to test and constrain models for the origin of large-scale structure. It is found that the motion of the Local Group relative to the mean of the sample at cz <900 km s-1 is undetectably small, the 90% upper bound being 140 km s-1. The shear due to the mass concentration in the Local Supercluster is detected at local Virgocentric flow speed vVc = 160±62 km s-1. A simple explosion picture cannot account for the mean motion of the sample of galaxies at cz <900 km s-1 relative to the frame defined by the microwave background radiation, vLS = 600±52 km s-1.

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