Head-on Collision of Disk–Sphere Galaxies |
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| Authors: | P M S Namboodiri K S Sastry K S V V S Narasimhan |
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| Institution: | (1) Indian Institute of Astrophysics, Bangalore, 560034, India;(2) Department of Astronomy, Osmania University, Hyderabad, 500007, India;(3) Inter-University Centre for Astronomy and Astrophysics, Pune, 411007, India |
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| Abstract: | Numerical simulations are performed to study the tidal effects of non-merging rapid head-on collision between a disk galaxy
and a spherical galaxy. The disk consists of three components – a disk, a bulge and a halo – and the spherical galaxy is a
Plummer model. The galaxies have the same dimensions with different mass ratios viz., 2, 1 and 0.5. They move in a rectilinear
orbit with a relative velocity of 1000 km s−1.
None of the simulations leads to the merger of the galaxies by tidal capture. The results of our simulations indicate that
although tidal effects are sensitive to both the mass ratio and the inclination of the disk to the orbital plane, it is the
mass ratio which is more important in producing tidal damage to the less massive galaxy. The spherical galaxy undergoes considerable
tidal effects if the mass of the disk is same or larger. On the other hand the collisions in which the mass of the spherical
galaxy is more, result in the formation of a ring structure after the closest approach and the structure disappears by the
end of the simulations. |
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| Keywords: | Galaxies:interactions Methods:numerical |
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