Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.152..131g&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 152, no. 1, Feb. 1989, p. 131-139.
Astronomy and Astrophysics
Astrophysics
Cosmic Gases, Disk Galaxies, Galactic Rotation, Halos, Rotating Matter, Angular Velocity, Mass Distribution, Mathematical Models, Navier-Stokes Equation, Problem Solving
Scientific paper
Previous observations of flat or slowly rising rotation curves up to large distances from the center found for large disk galaxies of all Hubble types are explained using normal fluid dynamic considerations under the assumption that viscous (and/or magnetic) transfer of mass and angular momentum from the inner to outer regions of these galaxies is efficient. The results are consistent with the flow of gas from the halo to the disk in regions that are close to the axis of rotation. The existence of rising rotation curves in some galaxies with varying gradients and flat rotation curves implies that these galaxies are not coeval.
Basu Baidyanath
Bhattacharyya Tara
Ghosh Mita
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