Galaxy Collision Simulations 2004-2007

• The Tree Code Method (these notes were extracted from Barnes article on the web)
• Research Project in Galaxy-Galaxy Collision Simulations
• Summer 2003 - Treecodes
• Simulation(Quicktime 1.6MB) - 4096 stars per galaxy
• Simulation(Quicktime 3.8MB) - 32768 stars per galaxy
• Simulation(Quicktime 4.0MB) - 32768 stars per galaxy + rotation
• Simulation(Quicktime 5.2MB) - 13000 stars per galaxy + real data model of rotating Milky Way spiral galaxy
• Simulation(Quicktime 5.3MB) - 44000 stars per galaxy + real data model of rotating Milky Way spiral galaxy
• Simulation(Quicktime 18.7MB) - 44000 stars per galaxy + real data model of rotating Milky Way spiral galaxy - FULL EVOLUTION
• Images from Galaxy-Galaxy Collision Simulation - 44000 stars per galaxy + real data model of rotating Milky Way spiral galaxy

Galaxy Collision Simulations 2008

• Elizabeth Wesson(2010) Research Poster
• Simulation(Quicktime MOV) Using F95 BH Codes and MATLAB (210K stars - Dark matter included(not visible))
• Simulation(Quicktime MOV) Using F95 BH Codes and MATLAB (210K stars - Dark matter included(not visible))
• Simulation(Quicktime MOV) Using F95 BH Codes and MATLAB (210K stars - Dark matter included(not visible))
• Simulation(Quicktime MOV) Using modified Particula App (Xcode-C++) by Abe Hiroshi (14K stars - Dark matter included(visible as tiny red dots))
• Simulation(Quicktime MOV) Using modified Particula App (Xcode-C++) by Abe Hiroshi (14K stars - Dark matter included(visible as tiny red dots))

Oblique Collision - Small Galaxy hitting larger galaxy - Off center - Dark matter not visible

New Galaxy-Galaxy Collision Research Project - Spring 2011

Researchers - Swarthmore students: Margaret Regan('14), Chris Lynn('14), Sudarshan Gopaladesikan('14)

First Interesting Collision

• Simulation(Quicktime MOV) (Kuzmin-Plummer-Isothermal Bulge-Disk galaxies - 21K stars total - Dark matter included(not visible))

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Galaxy Collision Simulations 2012

Latest galaxy-galaxy collision simulations shown below. 
Thanks to my research students Maggie Regan and Chris Lynn.

First - two spiral galaxies (disk + bulge + dark matter halo(not shown)) both
rotating in same direction.

Second - two spiral galaxies (disk + bulge + dark matter halo(not shown))
rotating in opposite directions.

Third - two spiral galaxies (disk + bulge + dark matter halo(not shown))
rotating in opposite directions - long run.

Further Results from 2012

• Collision between two differently oriented galaxies - very interesting end results

Head-On Collision - Two Spiral-Type Galaxies - Dark Matter Not Visible

200,000 stars per galaxy - iMac 4 processor calculation - 2013 calculation

Programming References

• APL
• NetLib Parallel Computing
• High Performance Computing
• Extreme Programming
• VAST/Parallel Computing
• Tree Code Homepage
• NEMO Homepage
• NAG Fortran
• Tachyon Parallel Ray Tracer
• GNU Fortran
• About the MPI-1 and MPI-2 standards
• About the LAM MPI Implementation
• About the MPICH Implementation
• About the IMPI standard
• Parallel Programming with MPI
• Numerical Recipes in Fortran
• OpenGL Graphics
• O'Reilly Network: Building a Black Hole With OpenGL
• Vermont recipes

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