The formation of faint ring structures

Details The formation of faint ring structures The formation of faint ring structures

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.121..213c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 121, no. 2, April 1986, p. 213-224.

Statistics

Computation

5

Computational Astrophysics, Galactic Evolution, Galactic Structure, Luminosity, Ring Structures, Disk Galaxies

Scientific paper

Using the impulsive approximation technique, the faint ring structures formed by an off-center collision in which a polytropic model spherical galaxy moves normal to the plane of an exponential model disk galaxy and grazes its periphery, are studied. The galaxies have equal radii, but due to the high concentration of the sphere its radius is effectively one-third that of the disk. As a result of the collision the disk galaxy is found to expand and attain an oblate shape. If the fractional change in binding energy of the disk galaxy lies between 0.001 and 0.01, then a faint ring structure which does not close in on itself is formed, and if it is about 0.01 then a bridge and tail are also formed. Such low-energy collisions produce minor structural changes in the disk which are seen as asymmetric due to the higher energy changes occurring preferentally in the side nearer to the perturbing galaxy than in the opposite side.

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