Supercluster-supercluster interactions

Journal Article · Tue May 15 04:00:00 EDT 1984 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/162014· OSTI ID:6195247

Shaya, E J

Monte Carlo simulations are made to determine the probability distribution of peculiar velocities and shear velocities of superclusters. Mass fluctuations on the scale of superclusters are represented as mass points distributed randomly in three dimensions. Accelerations and the components of the tidal tensor at the center of a spherical region due to the gravitation of masses exterior to the sphere are calculated. It is concluded that peculiar velocities greater than approx.200 km s/sup -1/ are expected in a majority of superclusters if ..cap omega..> or approx. =1 and N/sup -1/3//R= 1 = 3.2, where N is the number density of substantial superclusters and R= 1 is the mean super-cluster radius at which delta, the fractional density excess internal to R, reaches unity. A peculiar velocity of approx.300 km s/sup -1/ for our supercluster implies a 95% probability that ..cap omega..>0.2. A shear velocity of approx.150 km s/sup -1/ at our position in the supercluster is expected if superclusters have mass excesses of approx.3 x 10/sup 15/ M/sub sun/ (..cap omega..approx.1) and are at a number density of 1 per (80 Mpc)/sup 3/. The distribution of tidal strengths in the direction of maximal distention is compared with self-gravitational forces in the outer regions of superclusters; tidal fields are found to strongly influence the low-density outer contours of superclusters.

• Research Organization: Institute for Astronomy, University of Hawaii
• OSTI ID: 6195247
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 280:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105 -- Astrophysics & Cosmology-- Galaxies
640106* -- Astrophysics & Cosmology-- Cosmology
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BASIC INTERACTIONS
COSMOLOGY
CRITICAL MASS
DISTRIBUTION FUNCTIONS
FUNCTIONS
GALACTIC EVOLUTION
GALAXY CLUSTERS
GRAVITATIONAL INTERACTIONS
INTERACTIONS
MASS
MONTE CARLO METHOD
POPULATION DENSITY
PROBABILITY
TENSORS
VELOCITY