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Dynamics of superclusters: initial determination of the mass density of the universe at large scales

Journal Article · · Astrophys. J., Lett. Ed.; (United States)
DOI:https://doi.org/10.1086/183521· OSTI ID:6192143
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We have measured radial velocities of cluster members of two rich, large superclusters in order to probe the supercluster mass densities and have computed simple evolutionary models to place limits upon the mass density within each superclusters. These supercluster represent true physical associations of size approx.100 Mpc (for H/sub 0/ = 50 km s/sup -1/ Mpc/sup -1/) seen presently at an early stage of evolution. One supercluster is weakly bound, the other probably barely bound, but possibly marginally unbound. Gravity has noticeably slowed the Hubble expansion of both superclusters. We used galaxy surface-density counts and the density enhancement of Abell clusters within each super-cluster to derive the ratio of mass densities of the supercluster to the mean field mass density. The results strongly exclude a closed universe. We obtain ..cap omega.. < or approx. = 0.30 with a preferred range 0.06 < or approx. =..cap omega..< or approx. = 0.16. This preferred range for the cosmological density parameter corresponds to a mass-to-luminosity range of 48 < or approx. = M/L < or approx. = 129 in solar units.
Research Organization:
University of California, Los Angeles
OSTI ID:
6192143
Journal Information:
Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 245:2; ISSN AJLEA
Country of Publication:
United States
Language:
English

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Related Subjects

640105 -- Astrophysics &amp; Cosmology-- Galaxies
640106* -- Astrophysics &amp; Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGY
FUNDAMENTAL CONSTANTS
GALACTIC EVOLUTION
GALAXY CLUSTERS
MASS
RADIAL VELOCITY
RED SHIFT
UNIVERSE
VELOCITY