Peculiar velocity field in flattened superclusters

Journal Article · Sat Jan 15 04:00:00 EST 1983 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183939· OSTI ID:6051221

Szalay, A S; Silk, J

The linear growth rate of small transverse perturbations in a self-gravitating, collisionless gas that is undergoing a one-dimensional collapse is strongly influenced by the nonlinear flow of the background. In the collapse plane, smaller Hubble flow deviations and infall velocities are obtained than in the simple linear theory. Application of this theory to the kinematics of galaxies in a flat supercluster shows that the usual linear approximation may seriously underestimate ..cap omega.., the density parameter of the universe, if there is a strong deviation from spherical symmetry. Furthermore, dissipative separation of baryonic matter from collisionless dark material (such as hypothesized massive neutrinos) enhances this effect, leading to apparent ..cap omega.. values of 0.2--0.3 for a wide range of separation parameters in an Einstein--de Sitter (..cap omega.. = 1) model.

• Research Organization: Astronomy Department, University of California, Berkeley
• OSTI ID: 6051221
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 264:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640105 -- Astrophysics & Cosmology-- Galaxies
640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
COSMIC GASES
COSMOLOGICAL MODELS
COSMOLOGY
DISTURBANCES
ELEMENTARY PARTICLES
FERMIONS
FLUIDS
FOURIER TRANSFORMATION
FUNDAMENTAL CONSTANTS
GALAXY CLUSTERS
GASES
GRAVITATIONAL COLLAPSE
HADRONS
INTEGRAL TRANSFORMATIONS
MATHEMATICAL MODELS
TRANSFORMATIONS
UNIVERSE