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Dynamically hot galaxies. I - Structural properties
Bender, Ralf; Burstein, David; Faber, S. M.
AA(Landessternwarte Königstuhl, Heidelberg, Germany), AB(Arizona State University, Tempe, AZ), AC(Lick Observatory, Santa Cruz, CA)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 399, no. 2, p. 462-477. (ApJ Homepage)
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NASA/STI Keywords:
Elliptical Galaxies, Galactic Structure, Gas Dynamics, Hot Stars, Star Distribution, Astronomical Photometry, Brightness Distribution, Lenticular Bodies
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Results are reported from an analysis of the structural properties of dynamically hot galaxies which combines central velocity dispersion, effective surface brightness, and effective radius into a new 3-space (k), in which the axes are parameters that are physically meaningful. Hot galaxies are found to divide into groups in k-space that closely parallel conventional morphological classifications, namely, luminous ellipticals, compacts, bulges, bright dwarfs, and dwarf spheroidals. A major sequence is defined by luminous ellipticals, bulges, and most compacts, which together constitute a smooth continuum in k-space. Several properties vary smoothly with mass along this continuum, including bulge-to-disk ratio, radio properties, rotation, degree of velocity anisotropy, and 'unrelaxed'. A second major sequence is comprised of dwarf ellipticals and dwarf spheroidals. It is suggested that mass loss is a major factor in hot dwarf galaxies, but the dwarf sequence cannot be simply a mass-loss sequence, as it has the wrong direction in k-space.

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