Identikit is a numerical method, combining test-particle and self-consistent techniques, which allows a rapid exploration of the parameter space of galactic encounters. It can be used to find the parameters required to reproduce the observed morphology and kinematics of interacting disk galaxies.
|Identikit 1 model (points) matching a self-consistent N-body simulation of a galactic collision (grey scale). Each panel shows a different projection: top left shows sky-plane (X,Y), top right shows velocity-position (V, Y); bottom left shows position-velocity (X, V), bottom right shows (X, Z).||Identikit 2 model of NGC 4676. Grey-scale shows HI data (Hibbard & van Gorkom 1996), projected on (α,δ) plane (top left), (V,δ) plane (top right), and (α,V) plane (bottom left). Dark blue crosses mark galaxy centers, cyan and magenta boxes are phase-space regions, and points show model derived using these constraints. Spherical lattice (bottom right) displays functions used to select viewing direction.|
— Paper describing the Identikit 1 system and a blind test of its abilities. Published in The Astronomical Journal, 137, 3071—3090, February 2009.
— Paper describing the Identikit 2 algorithm. Published in the Monthly Notices of the Royal Astronomical Society, 413, 2860—2872, June 2011.
— Web interface to Identikit 1 allowed the user to select encounter and viewing parameters, and see the results instantaneously. Unfortunately, the computer hardware which supported this service has failed. The Identikit Interface will not be available until further notice.
— Random merger simulations from the Identikit 1 paper; click on individual systems to see matches.
— Summary of the parameters needed to define an encounter between disk galaxies.
— Source code and key makefiles for Identikit 1.7. Requires the Zeno software environment.
— Source code and key makefiles for Identikit 2.2. Requires the Zeno software environment.
— A small set of data files for experimenting with the Identikit
software. The file jhat12X.dat records initial spin directions
of test particles, while the r124_*.dat files are individual
frames from an encounter between equal-mass galaxies. After downloading
these files, do
./idkit jhat12X.dat r124_%04x.dat incr=0x100
to try the program.
— Talk given at Academia Sinica Institute of Astronomy and Astrophysics, June 4, 2008.
— John Hibbard's page describing an earlier version.
Joshua E. Barnes
(barnes at ifa.hawaii.edu)
07 November 2012