Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.327..210p&link_type=abstract
Nature (ISSN 0028-0836), vol. 327, May 21, 1987, p. 210, 211. NSF-supported research.
Astronomy and Astrophysics
Astronomy
169
Astronomical Models, Background Radiation, Galactic Clusters, Velocity Distribution, Baryons, Galactic Evolution, Jeans Theory, Mass Distribution, Red Shift, Universe
Scientific paper
The galaxy peculiar velocity field (velocity relative to the uniform Hubble law expansion) seems to have a large r.m.s. value, ≡500 km s-1, and a large coherence length ⪆50 Mpc. A model that does explain this fact assumes that, at high redshift, mass was uniform and the baryon number was inhomogeneous, a stationary random process. This produces in the late universe a baryon distribution with a power spectrum proportional to the initial value at short wavelength, a prominent peak in the spectrum at the matter-radiation Jeans length, and a sharp cutoff at longer wavelengths. The author shows how this spectrum, normalized by the observed galaxy clustering, can produce by gravity the large velocity field with large coherence length needed without excessively perturbing the microwave background.
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