Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...141..171p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 141, no. 1, Dec. 1984, p. 171-188. Research supported by the Universite de Gen
Astronomy and Astrophysics
Astrophysics
64
Astronomical Models, Barred Galaxies, Self Consistent Fields, Velocity Distribution, Ellipsoids, Gas Dynamics, Least Squares Method, Orbits, Radial Velocity, Two Dimensional Models
Scientific paper
Schwarzschild's (1979) method is used to construct self-consistent 2D models of a well-pronounced and fast-rotating barred galaxy. The adopted method is described, and the computational problems and morphology of the orbits are discussed. The resulting velocity fields are examined and the set of solutions permitted by the density constraint, to which various additional constraints are added, is analyzed. Some observations are qualitatively compared with the models. In all cases, retrograde motion is found to play a nonnegligible role: between 10 and 30 percent of the mass moves in retrograde motion, while in the lens the relative local retrograde mass can exceed 50 percent. The proportion of semiergodic stars may be as large as 30 percent, but is probably below 10 percent. Simple looped orbits, allowing for gas motion, settle preferentially in the bar and at the location of the inner cavity, as foreseen by orbital studies.
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