Ring structure in disk galaxies

Details Ring structure in disk galaxies Ring structure in disk galaxies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385...83z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 83-86.

Astronomy and Astrophysics

Astrophysics

4

Disk Galaxies, Galactic Structure, Ring Structures, Dynamic Characteristics, Equations Of Motion, Galactic Rotation, Kinematics

Scientific paper

The properties of the solutions to the equations of motion of a gas disk with dispersion are investigated. The rotation curve of the disk is divided into two parts and each is considered separately. First, if the rotation speed is an increasing function of radius, it is shown that concentric rings are possible. Second, if the rotation curve is flat or a decreasing function of radius, there is at most one ring possible in this region. Previously, galactic ring structure was considered to arise from a forcing bar or oval distortion. This work shows that rings are possible in high symmetry systems such as NGC 7020 with no observable bar.

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