Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....88..159v&link_type=abstract
Astronomy and Astrophysics, Vol. 88, P. 159, 1980
Astronomy and Astrophysics
Astrophysics
97
Scientific paper
In this paper (Paper II) we present gasdynamical models for the spiral galaxy M 81 and compare these with high-resolution hydrogen-line observations. The observed gas flow inside about 9 kpc from the centre is consistent with the presence of a spiral potential perturbation rotating in the galactic plane; it can satisfactorily be described by the nonlinear density-wave theory for the gas, including galactic shocks, after considering the smoothing effects of the telescope beam. However, there is evidence for a (small) phase shift between density and velocity perturbations, and also the western arm shows anomalous behaviour in some respect. The amplitude of the stellar density wave required for the observed density and velocity perturbations in the gas is consistent with the observed amplitude as derived from surface photometry in Paper I. The density wave causes a distortion of the rotation curve; correction for this effect is required for an acceptable model. We also discuss the galactic shock in relation to dust lanes and H II regions.
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