Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364l...1l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. L1-L4.
Astronomy and Astrophysics
Astrophysics
7
Cosmology, Dark Matter, Galactic Clusters, Galactic Evolution, Galactic Structure, Hubble Constant, Disk Galaxies, Dwarf Galaxies, Spiral Galaxies
Scientific paper
The masses of galaxies and the origin of the Hubble sequence are considered empirically. Normal galaxies lie in the region where the cooling time is greater than the dynamical time, and less than the Hubble time. The combination of this criterion with the cold dark matter (CDM) fluctuation spectrum defines the masses of galaxies. Dwarf galaxies occur when the cooling time is not greater than the dynamical time. Two features differentiate spirals and ellipticals. Spirals lie near the locus defining 1 sigma fluctuations in the CDM model, while ellipticals are 2-3 sigma fluctuations. When spirals and ellipticals are projected to distributions over temperature, the transition from ellipticals to spirals can be interpreted as differences in the properties of the cooling curve. Ellipticals lie in the region where cooling does not become more efficient at lower temperature. Spirals are those galaxies where cooling becomes more efficient at low temperature.
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