Gravitational spurs and resonances - Effects of small mass disturbers in spiral galaxy disks

Details Gravitational spurs and resonances - Effects of small mass disturbers in spiral galaxy disks Gravitational spurs and resonances - Effects of small mass disturbers in spiral galaxy disks

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286...62b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 62-67. Research supported by the University of Alabam

Astronomy and Astrophysics

Astrophysics

17

Astronomical Models, Galactic Structure, Gravitational Effects, Gravitational Fields, Mass Distribution, Spiral Galaxies, Andromeda Galaxy, Cosmic Gases, Galactic Evolution, Molecular Clouds, Orbital Elements, Radii

Scientific paper

It has been suggested that the short spurs in both two-armed and chaotic spiral galaxies are localized gravitational disturbances (density wavelets) caused by orbiting clouds of gas and stars in the disk. New N-body computer simulations investigate the effects of a disturber on a galaxy's stellar disk. Disturber parameters of the NGC 206 cloud in M31 (8×107 M_sun;, 8 kpc) were assumed as a realistic example. These simulations confirm the less general calculations of Julian and Toomre in the small region around an NGC 206 cloud mass orbiting disturber. A simulation with a more massive disturber shows a better defined pattern that clarifies the lower mass runs. The main structure is a spiral arc of density peaks rotating at the same angular rate as the disturber. The density peak radii correspond to theoretical positions of epicyclic resonances with the main spur around the orbiting disturber.

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