GALAXY package for N-body simulation

Abstract

This posting announces public availability of the GALAXY software package developed by the author over the past 40 years. It is a highly efficient code for the evolution of (almost) isolated, collisionless stellar systems, both disk-like and ellipsoidal. In addition to the N-body code galaxy, which offers eleven different methods to compute the gravitational accelerations, the package also includes sophisticated set-up and analysis software. This paper gives an outline of the contents of the package and provides links to the source code and a comprehensive on-line manual. While not as versatile as tree codes, the particle-mesh methods in this package are shown, for certain restricted applications, to be between 50 and 200 times faster than a widely-used tree code.

This is a brief summary, the full manual is at http://www.physics.rutgers.edu/~sellwood/manual.pdf and the source code is at http://www.physics.rutgers.edu/galaxy

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• Three Mechanisms for Bar Thickening
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• The global stability of M33: still a puzzle
• Barred spiral galaxies in modified gravity theories
• Towards time symmetric N-body integration
• A New Channel of Bulge Formation via The Destruction of Short Bars
• The Impact of Stellar Migration on Disk Outskirts
• Relaxation in N-body simulations of spherical systems
• Spiral instabilities: little interaction with a live halo
• Internally-driven warps in disc galaxies
• Orthogonal vertical velocity dispersion distributions produced by bars
• Made-To-Measure Models of Self-Similar Triaxial Halos with Steep Inner Density Gradients
• A bar stability criterion distinguishing between modified gravity and dark matter in galaxies