Astronomy Seminar: 1. Modeling kinematics, shocks and cooling in gas rich galactic disk collisions

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Date/Time:Friday, 06 Dec 2019 from 4:10 pm to 5:00 pm
Location:Rm 38, Physics Hall
Contact:Curt Struck
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Travis Yeager, ISU

Splash bridges are formed from the direct inelastic collisions between gas elements in gas rich galaxies. We simulate gas disks collisions at different inclinations and offsets with the ability to track shock heating and gas cooling in the gas over time. We find that the resulting splash bridge depends strongly on the initial disk collision inclination and offset. Low offset and inclination collisions generally leave behind a flat region of gas between the two galaxies, whereas large offsets and low inclinations produce long twisted sheets of gas. We also find that across all collisions, independent of the inclination or offset, the relaxed normalized Mach numbers and shock velocity distributions of cloud-cloud collisions follow a very similar form except at high velocities. There is good evidence of continued turbulence in the gas of each splash bridge for all inclinations and offsets tested. The amount of turbulence increases with the inclination. Our model results compare well with the recent ALMA observations of the Taffy galaxies - NGC 12914/15 by Appleton, et al.