The determination of the deceleration parameter from local data

Details The determination of the deceleration parameter from local data The determination of the deceleration parameter from local data

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phys...21..635y&link_type=abstract

(University of Copenhagen, Danish Research Council and Nordisk Institut for Teoretisk Atomfysik, Copenhagen Symposium on the Uni

Astronomy and Astrophysics

Astronomy

8

Cosmology, Deceleration, Galactic Structure, Radial Velocity, Space Density, Universe, Virgo Galactic Cluster, Astronomical Catalogs, Dynamic Models, Galactic Rotation, Hubble Diagram, Velocity Distribution

Scientific paper

The Virgo cluster is found to be surrounded by a large complex of galaxies whose density excess above the zero baseline density falls off as 1/V squared with Virgocentric distance V. The mean density excess of galaxies in a sphere centered on Virgo with the Local Group at its periphery is approximately equal to 3. The peculiar velocity field which this density perturbation has generated is found to be small. The peculiar velocity of the Local Group relative to Virgo is between 100 and 200 km/s. If the total mass-energy density in the Virgo complex is clustered as the galaxies are, then the universe is open. The deceleration parameter is determined to be about 0.02 with approximately a 50% uncertainty.

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