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Differential Galactic Rotation Documents
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The EJS Differential Galactic Rotation Model illustrates the model of galactic rotation proposed by Jan Oort in 1927. In Oort's model most of the mass of the galaxy is concentrated at the center. Stars move in circular orbits around the center, with orbital speeds that are inversely proportional to the square root of their distance from the center. Oort realized that this model produced a specific pattern of radial velocities in the stars near the sun, and that this pattern matched the observational data fairly well. The simulation is intended to illustrate both Oort's model and the resulting pattern in the radial velocities. The simulation can also depict the so-called "high-velocity" stars, which are stars that have very low orbital speeds (treated as zero in the simulation) around the galactic center and therefore have high speeds relative to the sun.
Last Modified June 3, 2014
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Source Code Documents
The source code zip archive contains an XML representation of the EJS Differential Galactic Rotation Model. Unzip this archive in your EJS workspace to compile and run this model using EJS.
Released under a This material is released under the GNU General Public License Version 3.
Published May 19, 2011
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