Ejections of massive objects from the center of a stellar disk. I - Ejections in the plane of the disk.

Details Ejections of massive objects from the center of a stellar disk. I - Ejections in the plane of the disk. Ejections of massive objects from the center of a stellar disk. I - Ejections in the plane of the disk.

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..70..133c&link_type=abstract

Astrophysics and Space Science, vol. 70, no. 1, June 1980, p. 133-151.

Computer Science

Numerical Analysis

3

Computerized Simulation, Disk Galaxies, Galactic Evolution, Galactic Nuclei, Stellar Mass Ejection, Circular Orbits, Gravitational Effects, Numerical Analysis, Radial Velocity

Scientific paper

The effects of the ejection of massive objects from the central parts of galaxies were investigated. A galaxy is represented by a disk of noninteracting gravitating test particles, initially in circular orbits around a central point mass. A massive point-like object is ejected by the central mass with a purely radial velocity; it is shown that arms form when the nucleus ejects more than 1/20 of its mass. These arms form bridges when the object contains more than 1/5 of the total mass; when the ejection velocity increases, the arms become shorter. The arms persist for more than 10 to the 9th yr despite the winding up. Comparisons are made with experiments on galaxy encounters and with astronomical theories and observations. The study is continued with a numerical investigation of the behavior of a stellar disk when objects are ejected from the central part of the disk and out of its plane. The arms and distortions that occur in the systems are more pronounced when the trajectories of the ejected objects are close to the disk.

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