Mathematics – Logic
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365...13e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 13-21. Research supported by the Miller Foundation f
Mathematics
Logic
36
Dark Matter, Galactic Clusters, Galactic Structure, Space Density, Many Body Problem, Morphology, Spatial Distribution
Scientific paper
A model is explored in which the observed galaxy morphology-density relation is intrinsically related to the initial fluctuations from which galaxies formed in a universe dominated by cold dark matter (CDM). A direct mapping between initial peak height and final galaxy morphology with sharp thresholds dividing the principal Hubble types is assumed. Using a simplified, fully analytic formalism appropriate to Gaussian models, it is shown how a background cluster or group of galaxies may modulate the abundances of different morphological types. The model accounts for the observed power-law relation between the elliptical fraction and the combined fraction of elliptical and lenticular galaxies. This analytic approach is then extended using N-body simulations. The results support the validity of this prescription for differentiating disk from spheroidal galaxies. A power-law segregation between luminous and dark matter densities is predicted by the simulations.
Evrard August E.
Silk Joseph
Szalay Alex S.
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