Infrared emission and tidal interactions of spiral galaxies
We use computer simulations of tidal interactions of spiral galaxies and find that the stronger the tidal perturbation by a companion, the more disk gas clouds are thrown into nucleus-crossing orbits and the greater their collision velocities in the disk. More intense and hotter IR emission would result, matching observations by Telesco, Wolstencroft and Done of greater and hotter IR emission for spiral galaxies with closer and/or more massive companions. Disturbances propagate inward from the edges to cause nuclear inflow. In Telesco et al.'s IR pairs, the larger members are the more IR luminous. Our simulations indicate that mass and size/separation effects cause this pattern.
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