Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....78...21i&link_type=abstract
Astronomy and Astrophysics, vol. 78, no. 1, Sept. 1979, p. 21-24.
Astronomy and Astrophysics
Astrophysics
37
Galactic Structure, Milky Way Galaxy, Protostars, Stellar Mass Accretion, Equations Of Motion, Galactic Rotation, Gravitational Fields, Ring Structures, Viscous Flow
Scientific paper
It is shown how a viscous accretion disk in a soft gravitational potential well develops a ring of excess surface density near the point where the rotation velocity begins to become proportional to the radial distance in the disk. This ring forms because the shear in that region of the disk tends to zero with decreasing radius, so that viscous transport of angular momentum decreases correspondingly near the potential minimum. The findings are applied to the disk of our Galaxy, and it is argued that similar flow patterns must be expected in protostars, protogalaxies and in galaxies that capture intergalactic matter. It is suggested that when the ring becomes sufficiently massive to influence the rotation curve, additional rings can be formed.
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