Formation of Galaxies inside clusters

Journal Article · Wed Aug 01 04:00:00 EDT 1973 · Astron. Astrophys., v. 27, no. 1, pp. 1-21

OSTI ID:4378377

Icke, V

A model is presented for the formation of clusters of galaxies, after the decoupling of radiation from matter in an Einstein-DeSitter Universe. It is assumed that due to primeval turbulence in the Universe some spheroidal regions of space expand somewhat slower than others. These slow-expansion regions, which have a mass between 10/sup 45/ and 10/sup 47/ kg, eventually stop expanding and subsequently collapse to high density. If such a region is not exactly spherical its deviation from sphericity will increase throughout the evolution. The turbulence inside this protocluster eads to the formation of galaxies. In order to study this formation, the growth rate of perturbations of a collapsing prolate spheroid is determined. The protocluster is assumed to be prolate because then the density enhancement is much larger than with an oblate spheroid. The protoclusters collapse within about 10/sup 17/ s predominantly into highly elongated clusters. The time needed for a galaxy to cross such a cluster along its major axis is about 4 x-10/sup 17/ s so that many of these clusters have not yet reached virial equilibrium at the present time. (WDM)

• Research Organization: Univ. of Sussex, Brighton, Eng.
• NSA Number: NSA-29-013675
• OSTI ID: 4378377
• Journal Information: Astron. Astrophys., v. 27, no. 1, pp. 1-21, Journal Name: Astron. Astrophys., v. 27, no. 1, pp. 1-21; ISSN AAEJA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*COSMOLOGY-- GRAVITATIONAL COLLAPSE
*GALAXIES-- ORIGIN
COUPLING
DISTRIBUTION
MATTER
N56600* --Physics (Astrophysics & Cosmology)--Cosmology
RADIATIONS
TURBULENCE