Infall patterns around rich clusters of galaxies

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 mode...

Full description

Saved in:
Bibliographic Details
Published in:The Astronomical journal 1989-09, Vol.98, p.755-765
Main Authors: Regos, Eniko, Geller, Margaret J.
Format: Article
Language:English
Subjects:
640105 - Astrophysics & Cosmology- Galaxies
ANALYTICAL SOLUTION
ASTROPHYSICS
BASIC INTERACTIONS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COSMOLOGY
DENSITY
DISTRIBUTION
GALAXY CLUSTERS
GRAVITATIONAL INTERACTIONS
INTERACTIONS
MASS DISTRIBUTION
MATHEMATICAL MODELS
MATHEMATICS
PHYSICAL PROPERTIES
RADIAL VELOCITY
RED SHIFT
SPATIAL DISTRIBUTION
STATISTICS
VELOCITY
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0004-6256
1538-3881
DOI:10.1086/115177