Infall patterns around rich clusters of galaxies

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115177· OSTI ID:5355554

Regos, E; Geller, M J ^[1]; Eotvos Lorand Tudomanyegyetem, Budapest ^[2]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA)
2. Hungary

The pattern of infall velocities induced by a rich cluster of galaxies is considered, using an infall model based on the Friedmann solution to determine the exact implicit dependence of the peculiar velocity on the density enhancment and the mean cosmological mass density, Omega(0). An analytic model for the distribution of galaxies around a cluster core in redshift space is developed. The high-density caustics in redshift space are shown to appear as envelopes around rich clusters. Assuming that the galaxies trace the matter distribution, low Omega(0) models can explain observational data obtained for four clusters. The present results support the prediction that light traces mass in the infall region. 26 refs.

• OSTI ID: 5355554
• Journal Information: Astronomical Journal; (USA), Vol. 98; ISSN 0004-6256
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXY CLUSTERS
GRAVITATIONAL INTERACTIONS
ANALYTICAL SOLUTION
ASTROPHYSICS
COSMOLOGY
DENSITY
MASS DISTRIBUTION
MATHEMATICAL MODELS
RADIAL VELOCITY
RED SHIFT
STATISTICS
BASIC INTERACTIONS
DISTRIBUTION
INTERACTIONS
MATHEMATICS
PHYSICAL PROPERTIES
SPATIAL DISTRIBUTION
VELOCITY
640105* - Astrophysics & Cosmology- Galaxies