The Distributions of the Density and the Mass for Spiral Galaxies
Rafidain Journal of Science,
2012, Volume 23, Issue 3, Pages 131-137
AbstractExpressions for the distributions of the density and mass of spiral galaxies have been derived for three different orientations of rotation curves with a turn over radius (rt). The central region of the galaxy is found to rotate as a rigid body with a constant density and with a central mass as a function of r3. The density of the outer regions (r > rt) is found to vary inversely with the radius (r), and the corresponding mass is found to be a function of r2. Galaxies with flat rotation curves at (r > rt) has less mass than that with rising up or lowering down rotation curves.
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