Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1461b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 99, May 1990, p. 1461-1469.
Astronomy and Astrophysics
Astronomy
8
Compact Galaxies, Computerized Simulation, Interacting Galaxies, Spiral Galaxies, Galactic Rotation, Gravitational Effects, H Ii Regions, Nebulae, Velocity Distribution
Scientific paper
An attempt is made to explain the observations of the spiral compact-companion system AM 2208 - 251 using a self-gravitating computer simulation of tidal effects of the companion on the spiral's disk. The companion swings past the disk in an initially zero energy orbit and pulls out particles forming a bridge and tail spiral arms. The gas particles in the disk are allowed to collide. As a result of collisions, clumps of gas particles are obtained, which are considered to be star-formation sites. To find the best agreement between the observations and the model, mass of companion, distance of approach, azimuthal viewing angle, and viewing time are changed. The model agrees best with the observations for the companion mass equal to 0.2 galaxy mass at 144 million yr after perigalactic point, azimuthal viewing angle 90 deg to the bridge arm, and distance of approaches 24 kpc, or 1.36 disk radii.
Byrd Gene Gilbert
Klaric Mario
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