Other
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..526s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 526-531.
Other
26
Elliptical Galaxies, Galactic Structure, Stellar Rotation, Gas Dynamics, H Ii Regions, Ring Structures
Scientific paper
NGC 4650A consists of two components, a diffuse central component (which looks much like an S0 galaxy), and a warped outer ring of H II regions. The projections of these two components onto the sky lie nearly perpendicular to each other. Measurements have been conducted of the rotation of the diffuse central component, and it is found that the ratio of rotation velocity at the last measured point to the central velocity dispersion, is greater than unity. This is consistent with a wide range of models, spanning a continuum with rapidly tumbling prolate systems at one extreme and nontumbling oblate ones at the other. For the nearly prolate configurations and for the oblate ones the ring of H II regions is unstable of differential precession and will settle to a position angle closer to the projected major axis of the central component. However, there may be a relatively oblate (but still triaxial) configuration for which the ring lies in a stable closed orbit.
Boksenberg Alec
Schechter Paul L.
Ulrich Marie-Helene
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