Observations and Simulation of N4676 ("The Mice" =
Arp 242 = UGC 7938/9)
John Hibbard, NRAO
The HI data were obtained at the
VLA in 5/91 & 5/92.
The Halpha and R-band data were
obtained with the KPNO 2.1m in 3/92.
The BVRK-band data were obtained with the UH88" in 1995-1997.
Halpha velocity data from
Mihos, Bothun & Richstone, 1993, ApJ 418, 82.
CO data were obtained
from OVRO with Min Yun in 12/94.
Simulation run with
Institute for Astronomy.
Simulations (J. Barnes, MNRAS, 2004, 350, 798):
Trade study done with Treecode, N=16,000, no gas. Optimized
velocity field in 20 runs. High-res model run with N=2E20=1million
particles. 4 runs varying Rperi.
Josh Barnes' webpage on Models of Interacting Galaxies
mpeg of Simulation. Time evolution. From
mpeg of Simulation Rotation of best match. Also from
Josh Barnes' mpeg movie of high-resolution particle simulation.
- MPEG of fit of N-body data (red dots) to HI (blue circles) and CO (black circle):
4 plane view (RA-Dec, Vz-Dec, RA-Vz, RA-z)
4 plane view (RA-Dec, Vz-Dec, RA-Vz,
RA-z) (0.9MB animated gif)
2 plane view (RA-Dec, Vz-Dec (1.1MB mpg)
- Final N-body Fit to Observations
- Top view, different color coding
- N-body Time Evolution
- Modeling trade study
(varying arguement of periapses only)
- 1 Million particle simulation
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Last modified: Fri Oct 10 13:22:36 EDT 2003