GALAXY N-body simulation package

©2014 J. A. Sellwood, formerly Rutgers University, now Steward Observatory

A simulation of a disk galaxy
that used 200 million particles.
Sellwood & Carlberg (2014)

NEWS: Version 15, in which all use of commercial software (i.e. NAG) has been eliminated, is now available. The default version downloaded from here is now version 16.11

A few known problems and a history of previous versions can be found here.

Please enter your email address, so that you can be notified of important updates, and then click on "download" to obtain a copy of version 15.34 of the software.

E-mail address:


The file "galaxy.tgz" will appear in your Download directory. For news of updates and known bugs , click here (updated Aug 16, 2023).


A comprehensive manual (pdf) is available here that explains how to install and use the code. Recent manual changes: Dealing with "argument mismatch" errors from gfortran in footnote 8, p13. Two other changes are highlighted in green. Improved advice on time steps can be found on p57 and improved, but still far from perfect, code to implement Shu's method to compute DFs for disks is announced on p81, and is now released.


Rutgers Astrophysics