Mathematics – Logic
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233...56s&link_type=abstract
Astrophysical Journal, Part 1, vol. 233, Oct. 1, 1979, p. 56-66.
Mathematics
Logic
97
Galactic Evolution, Galactic Rotation, Galactic Structure, Spiral Galaxies, Star Formation, Stellar Models, Entropy, Gas Dynamics, Pitch (Inclination), Radial Distribution, Spatial Distribution, Spectrophotometry, Star Distribution, Star Formation Rate, Stochastic Processes, Ubv Spectra
Scientific paper
Properties of model galaxies produced by the stochastic, self-propagating star-formation model are examined and compared with the observed good correlations between the morphological type of a spiral galaxy and its rotational velocity, color, and gas fraction. It is shown that this star-formation model directly correlates the morphological type with the rotation curve and that the major parameter determining the morphological type of a normal disk galaxy is the maximum velocity of that curve. The relative star-formation rates given by the model are found to lead qualitatively to the observed variation of integrated colors and gas fraction as a function of morphological type, as well as to the observed radial decrease in the density of regions of recent star formation. The ability of the model to yield spiral arms in red plates is demonstrated, and the color profiles across spiral arms are discussed.
Gerola Humberto
Seiden Philip E.
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