Distribution of dark matter, galaxies, and the intergalactic medium in a cold dark matter dominated universe

Technical Report · Tue Nov 01 04:00:00 EST 1988

OSTI ID:5594978

Ryu, D; Vishniac, E T; Chiang, W H

The evolution and distribution of galaxies and the intergalactic medium (IGM) have been studied, along with collisionless dark matter in a Universe dominated by cold dark matter. The Einstein-deSitter universe with omega sub 0 = 1 and h = 0.5 was considered (here h = H sub 0 bar 100/kms/Mpc and H sub 0 is the present value of the Hubble constant). It is assumed that initially dark matter composes 90 pct and baryonic matter composes 10 pct of total mass, and that the primordial baryonic matter is comprised of H and He, with the abundance of He equal to 10 pct of H by number. Galaxies are allowed to form out of the IGM, if the total density and baryonic density satisfy an overdensity criterion. Subsequently, the newly formed galaxies release 10 to the 60th ergs of energy into the IGM over a period of 10 to the 8th years. Calculations have been performed with 32 to the 3rd dark matter particles and 32 to the 3rd cells in a cube with comoving side length L = 9.6/h Mpc. Dark matter particles and galaxies have been followed with an N-body code, while the IGM has been followed with a fluid code.

• Research Organization: Texas Univ., Austin, TX (USA)
• OSTI ID: 5594978
• Report Number(s): N-89-18276; NASA-CR--181450; NAS--1.26:181450; FERMILAB-PUBL--88/187-A
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
DATA
DISTRIBUTION
ELEMENTS
FLUIDS
GALACTIC EVOLUTION
GALAXIES
GASES
HELIUM
HUBBLE EFFECT
HYDROGEN
INFORMATION
NONLUMINOUS MATTER
NONMETALS
NUMERICAL DATA
RARE GASES
THEORETICAL DATA
UNIVERSE