Galactic scale gas flows in colliding galaxies: 3-Dimensional,N-body/hydrodynamics experiments |
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| Authors: | Susan A. Lamb Richard A. Gerber Dinshaw S. Balsara |
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| Affiliation: | (1) NORDITA and Neils Bohr Institute, Blegdamsvej 17, DK-2100 Københaven Ø, Danmark;(2) Departments of Physics and Astronomy, University of Illinois at Urbana-Champaign, 1110 W. Green Street, 61801 Urbana, IL, USA;(3) Department of Physics and Astronomy, Johns Hopkins University, Homewood Campus, 21218 Baltimore, MD, USA;(4) On leave from Departments of Physics and Astronomy, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA;(5) Present address: National Center for Supercomputer Applications, Beckman Institute, University of Illinois at Urbana-Champaign, 61801 Urbana, IL, USA |
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| Abstract: | We present some results from three dimensional computer simulations of collisions between models of equal mass galaxies, one of which is a rotating, disk galaxy containing both gas and stars and the other is an elliptical containing stars only. We use fully self consistent models in which the halo mass is 2.5 times that of the disk. In the experiments we have varied the impact parameter between zero (head on) and 0.9R (whereR is the radius of the disk), for impacts perpendicular to the disk plane. The calculations were performed on a Cray 2 computer using a combined N-body/SPH program. The results show the development of complicated flows and shock structures in the direction perpendicular to the plane of the disk and the propagation outwards of a density wave in both the stars and the gas. The collisional nature of the gas results in a sharper ring than obtained for the star particles, and the development of high volume densities and shocks. |
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