Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.242..194l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 242, Jan. 15, 1990, p. 194-199.
Astronomy and Astrophysics
Astronomy
35
Angular Momentum, Extragalactic Radio Sources, Galactic Evolution, Galactic Nuclei, Molecular Clouds, Ring Galaxies, Accretion Disks, Astronomical Models, Carbon Monoxide, Galactic Rotation, H Alpha Line, Viscosity
Scientific paper
A simple physical model is presented for the origin of molecular gas rings in galactic central regions. The appearance of enhanced gas density near the central bulge in a galaxy can be connected to the viscous transport of angular momentum, similar to the evolution of classical viscous accretion disks. At radii where galaxies rotate differentially, angular momentum is transported outwards, and the gas at smaller radii is accreted on to the rigidly rotating inner regions. The model predicts that molecular rings in a galaxy should be formed by an enhancement of the gas density in spatial regions where the rigid rotation passes into differential rotation, strongly dependent on the sharpness of the transition of the rotation law from rigid rotation to differential rotation.
Barteldrees Andreas
Biermann Peter L.
Crusius Andre
Dahlem Michael
Lesch Harald
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