An estimate of the velocity correlation tensor - Cosmological implications
- Princeton Univ., NJ (USA) Princeton Univ. Observatory, NJ (USA)
The peculiar velocity correlation tensor in the cosmic background radiation is estimated using observations of large-scale streaming motions. Two models are considered, which assume gravitational instability and random phase fluctuations: the CDM (cold dark matter) model representing the standard Omega = 1 CDM dominated universe with adiabatic scale invariant initial fluctuations and the Peebles' baryon isocurvature (PBI) model, an Omega = 0.4 baryon dominated universe with initial isocurvature (entropy) fluctuations. In both cases, the assumed Hubble constant is H = 50 km/sec Mpc. Unlike the CDM model, low Omega, baryon dominated PBI scenarios containing entropy perturbations can lead to correlated velocities over scales exceeding 4,000 km/sec. Predictions of both the CDM and PBI models are discussed. The velocity field in the local standard of rest frame determined by the galaxies themselves is also considered. 27 refs.
- OSTI ID:
- 7242274
- Journal Information:
- Astrophysical Journal; (USA), Vol. 346; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
RELICT RADIATION
VELOCITY
CORRELATIONS
COSMOLOGICAL MODELS
COSMOLOGY
ELLIPTICAL CONFIGURATION
GALACTIC EVOLUTION
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL INSTABILITY
NONLUMINOUS MATTER
SPIRAL CONFIGURATION
TENSORS
CONFIGURATION
ELECTROMAGNETIC RADIATION
INSTABILITY
MATHEMATICAL MODELS
MICROWAVE RADIATION
PLASMA INSTABILITY
RADIATIONS
640106* - Astrophysics & Cosmology- Cosmology