Other
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2078b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2078-2086
Other
6
Computerized Simulation, Density Wave Model, Disk Galaxies, Galactic Halos, Galactic Rotation, Galactic Structure, Interacting Galaxies, Spiral Galaxies, Astronomical Photography, Astronomical Photometry, Gravitation, Image Processing
Scientific paper
Observations and simulations of the galaxy NGC 4622 indicate that it has a true leading arm winding outward opposite the sense of disk spin. The arm is apparently a long-lived density wave leading out to a resonance ring. Simulations of a plunging retrograde passage of a small companion creates this pattern. A proper match to the observations does not result unless self gravity is unimportant in the disk. We now investigate whether or not NGC 4378, another single-armed disk galaxy, also has a leading density wave arm. We find via simulations that NGC 4378's pattern is not a leading density wave but is instead an impulsive trailing arm created by a grazing passage of a small companion. This impulsive arm has a short lifetime in the simulations. Nevertheless, like in NGC 4622, a nongravitating (halo dominated) disk is necessary to create the observed pattern in NGC 4378.
Byrd Gene Gilbert
Freeman Tarsh
Howard Sethanne
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