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written by Wolfgang Christian
The Orbits Within Spherical Galaxies model displays the two-dimensional trajectories of particles (stars) within a galaxy having a spherically symmetric mass distribution that heuristically approximates the distributions found in galaxies and bulges.  The model uses a mass density proposed by Walter Dehnen to describe spatial distributions that vary as r-4 and  r-g in galactic envelopes and cores where g is an adjustable power-law parameter.  Units are chosen such that a typical galaxy has total mass M=1 and that the gravitational constant G=1.

The Orbits Within Spherical Galaxies model is a supplemental simulation for the article "Radial motion in a central potential for singular mass densities" by Ulrich Z├╝rcher and Miron Kaufman in the American Journal of Physics 79(5), 521-526 (2011) and has been approved by the authors and the American Journal of Physics (AJP) editor.  The simulation was developed using the Easy Java Simulations (EJS) modeling tool.  It is distributed as a ready-to-run (compiled) Java archive.  Double clicking the  ejs_mech_orbits_OrbitsWithinSphericalGalaxies.jar file will run the program if Java is installed.

Please note that this resource requires at least version 1.5 of Java.
View the source code document attached to this resource
  • Orbits Within Spherical Galaxies Source Code
    The source code zip archive contains an XML representation of the Orbits Within Spherical Galaxies model.   Unzip this archive in your EJS workspace to compile and run this model using EJS.
Subjects Levels Resource Types
Astronomy
- Galaxies
= Galactic Structure
Motion, Forces, and Energy
- Gravity
= Orbits
= Universal Gravitation
- Motion in Two Dimensions
= Central Forces
- Upper Undergraduate
- Lower Undergraduate
- Instructional Material
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
  • Currently 0.0/5

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Access Rights: Free access
Program released under GNU-GPL. Narrative is copyrighted.
License: This material is released under a GNU General Public License Version 3 license.
Rights Holder: Wolfgang Christian
PACSs: 01.50.hv
07.05.Tp
05.10.-a
Keyword: Orbits
Record Cloner: Metadata instance created January 12, 2011 by Wolfgang Christian
Record Updated: Jun 11, 2014 by Andreu Glasmann
Last Update
when Cataloged:
January 12, 2011
Other Collections:

AAAS Benchmark Alignments (2008 Version)

4. The Physical Setting

4E. Energy Transformations
  • 6-8: 4E/M4. Energy appears in different forms and can be transformed within a system. Motion energy is associated with the speed of an object. Thermal energy is associated with the temperature of an object. Gravitational energy is associated with the height of an object above a reference point. Elastic energy is associated with the stretching or compressing of an elastic object. Chemical energy is associated with the composition of a substance. Electrical energy is associated with an electric current in a circuit. Light energy is associated with the frequency of electromagnetic waves.

AAAS Benchmark Alignments (1993 Version)

4. THE PHYSICAL SETTING

E. Energy Transformations
  • 4E (9-12) #2.  Heat energy in a material consists of the disordered motions of its atoms or molecules. In any interactions of atoms or molecules, the statistical odds are that they will end up with less order than they began?that is, with the heat energy spread out more evenly. With huge numbers of atoms and molecules, the greater disorder is almost certain.
ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
W. Christian, Computer Program ORBITS WITHIN SPHERICAL GALAXIES MODEL, Version 1.0 (2011), WWW Document, (http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074).
AJP/PRST-PER
W. Christian, Computer Program ORBITS WITHIN SPHERICAL GALAXIES MODEL, Version 1.0 (2011), <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074>.
APA Format
Christian, W. (2011). Orbits Within Spherical Galaxies Model (Version 1.0) [Computer software]. Retrieved September 23, 2014, from http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074
Chicago Format
Christian, Wolfgang. "Orbits Within Spherical Galaxies Model." Version 1.0. http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074 (accessed 23 September 2014).
MLA Format
Christian, Wolfgang. Orbits Within Spherical Galaxies Model. Vers. 1.0. Computer software. 2011. Java 1.5. 23 Sep. 2014 <http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074>.
BibTeX Export Format
@misc{ Author = "Wolfgang Christian", Title = {Orbits Within Spherical Galaxies Model}, Month = {January}, Year = {2011} }
Refer Export Format

%A Wolfgang Christian
%T Orbits Within Spherical Galaxies Model
%D January 12, 2011
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074
%O 1.0
%O application/java

EndNote Export Format

%0 Computer Program
%A Christian, Wolfgang
%D January 12, 2011
%T Orbits Within Spherical Galaxies Model
%7 1.0
%8 January 12, 2011
%U http://www.compadre.org/Repository/document/ServeFile.cfm?ID=10583&DocID=2074


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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

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Orbits Within Spherical Galaxies Model:

Is Based On Easy Java Simulations Modeling and Authoring Tool

The Easy Java Simulations Modeling and Authoring Tool is needed to explore the computational model used in the Orbits Within Spherical Galaxies.

relation by Wolfgang Christian

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