Mathematics – Logic
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285...25l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 25-43.
Mathematics
Logic
5
Galactic Structure, Molecular Clouds, Nebulae, Spiral Galaxies, Astronomical Models, Collision Parameters, Conformal Mapping, H Ii Regions, Shock Fronts, Shock Wave Propagation
Scientific paper
A model is considered in which giant molecular clouds (GMCs) are supported against spontaneous gravitational collapse by the pressure of their internal turbulence fed by collisions with small interstellar clouds whose motions are described by two-armed spiral-shock (TASS) wave hydrodynamics. By varying a model galaxy's total mass, its mass distribution, and its spiral pattern speed, galaxies of different spiral types are simulated. By adopting a picture in which unsupported GMCs collapse to form H II regions whereas those that receive too much energy are disrupted, the authors predict for each model galaxy the H II region and GMC radial distributions, the spiral arm width as a function of galactocentric radius, the overall appearance of the spiral structure, and the kinematics of the H II regions and GMCs. The model galaxies are compared with real spiral galaxies of various morphological types.
Bash F.
Leisawitz David
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