Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..688p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 15, 1991, p. 688-700.
Astronomy and Astrophysics
Astronomy
7
Galactic Evolution, Galactic Structure, Interstellar Gas, Interstellar Matter, Potential Theory, Ring Galaxies, Accretion Disks, Molecular Clouds, Numerical Integration
Scientific paper
The formation of gas rings in the outer regions of early-type galaxies is simulated using an N-body code. It is shown that viscosity is insufficient to prevent breakup of the disk, and thus gas clouds move to fill the available tube orbit. After a few precession times, particles have differentially precessed through 180 deg at a given radius and collisions occur in the symmetry plane of the tube orbit, forming a ring in situ. Results on the simulation of ring formation following the merger of a small gas-rich (dwarf-spiral) companion are presented. Accretion of gas into the core of the host galaxy is shown to occur when the gas is able to precess about both the minor and major axis in a triaxial potential.
Pearce Frazer R.
Thomas Peter A.
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