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The Distributions of the Density and the Mass for Spiral Galaxies | ||
| Rafidain Journal of Science | ||
| Article 12, Volume 23, Issue 3, 2012, Pages 131-137 PDF (0 K) | ||
| DOI: 10.33899/rjs.2012.44403 | ||
| Author | ||
| Nazzeha A. Daod | ||
| Abstract | ||
| Expressions 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. | ||
| Keywords | ||
| Rotation curve; density law; spiral galaxies | ||
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