The dynamics of the spiral galaxy M81. I - Axisymmetric models and the stellar density wave. II - Gas dynamics and neutral-hydrogen observations

Details The dynamics of the spiral galaxy M81. I - Axisymmetric models and the stellar density wave. II - Gas dynamics and neutral-hydrogen observations The dynamics of the spiral galaxy M81. I - Axisymmetric models and the stellar density wave. II - Gas dynamics and neutral-hydrogen observations

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88..149v&link_type=abstract

Astronomy and Astrophysics, vol. 88, no. 1-2, Aug. 1980, p. 149-174.

Astronomy and Astrophysics

Astrophysics

103

Astronomical Models, Density Wave Model, Dynamic Models, Galactic Rotation, Galactic Structure, Mass Distribution, Spiral Galaxies, Astronomical Photometry, Density Distribution, Gas Dynamics, Hydrogen, Line Spectra, Radial Velocity, Symmetry, Velocity Distribution, Wave Propagation

Scientific paper

A detailed comparison between the predictions of density-wave theory and observations of the spiral galaxy M 81 are presented. Axisymmetric models are considered and compared with stellar photometric data; in addition, the theoretical spiral pattern of the stellar wave computed on the basis of linear stellar density-wave theory is discussed. Further, gasdynamical models for M 81 are presented and compared with high-resolution H-line observations. The observed gas flow inside about 9 kpc from the center is consistent with the presence of spiral potential perturbation rotating in the galactic plane; it can satisfactorily be described by the nonlinear density-wave theory for the gas.

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