Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...306...48v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 306, July 1, 1986, p. 48-63.
Astronomy and Astrophysics
Astrophysics
34
Galactic Nuclei, Galactic Rotation, Gas Dynamics, Hydrogen Ions, Stellar Motions, Astronomical Models, Density Distribution, Galactic Bulge, Milky Way Galaxy, Radial Distribution, Streams
Scientific paper
The stellar dynamical consequences of assuming that the tilted ring of H I gas at about r = 1.5 kpc is in a steady state are explored. It is shown that this implies that the Galactic bulge is triaxial and counterrotating with respect to the disk. Two self-consistent models for a bulge in a realistic Galactic potential are obtained by means of a modification of Schwarzschild's (1979) method. It is concluded that it is not possible to construct a realistic triaxial object such that figure rotation and the matter streaming have opposite signs in an inertial reference frame. Observations of planetary nebulae and OH/IR stars in the Galactic center do not favor a model in which the bulge stars rotate in the direction opposite to that of the disk material. These findings make it unlikely that the 22 deg tilt of the H I ring at r = 1.5 kpc can be explained in terms of the tilted stable retrograde anomalous orbits in a rotating triaxial bulge.
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