Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..365g&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 2, Dec. 1975, p. 365-376.
Astronomy and Astrophysics
Astrophysics
211
Cosmology, Density Distribution, Galactic Clusters, Galactic Evolution, Luminous Intensity, Spatial Distribution, Astronomical Models, Astronomical Spectroscopy, Covariance, Gravitational Collapse, Hubble Diagram, Perturbation Theory
Scientific paper
Implications of recent data on the spatial distribution and luminosity function of galaxies are discussed, and it is suggested that the evidence is consistent with a 'unified' scheme in which galaxies and clusters of galaxies evolved at the recombination epoch from small density fluctuations with a smooth power-law spectrum. In the context of the Einstein-de Sitter and 'standard open' Friedmann models, detailed consideration is given to the predicted covariance function of galaxies implied by the gravitational-instability scheme and to the different approximate power-law slopes obtained for the virialized, nonvirialized, and linear regimes. The multiplicity function for clusters and groups of galaxies is analyzed, and the possibility is considered that the galactic luminosity function may be determined by the process of gravitational instability and clustering. A simple theory of constant-curvature isothermal baryon fluctuations is outlined. It is concluded that such fluctuations can form galaxies and clusters at the same time through gravitational instability and that the theory naturally produces the proposed power-law spectrum at recombination.
Gott Richard J. III
Rees Martin J.
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