Astronomy and Astrophysics – Astronomy
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.3608a&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #36.08; Bulletin of the American Astronomical Society, Vol. 26, p.917
Astronomy and Astrophysics
Astronomy
Scientific paper
Collisions and mergers of between galaxies are spectacular events that may have profound implications for galactic evolution. A complete description of what happens in a merger challenges our understanding of not only stellar and gas dynamics, but also the process of star formation. However, there exists a rare class of colliding galaxies, the ring galaxies, which represent a more tractable dynamical problem than a more general merger. Ring galaxies are thought to form when an intruder galaxy makes a near ``bulls-eye'' collision with a disk galaxy, driving radially expanding density waves into the disk. Although not without complications, the inherent symmetry of the collison makes these ``cosmic accidents'' remarkable laboratories for studing the processes that lead to massive star formation. Results from a major multi-wavelength study of a dozen ring galaxies will form the basis of this talk. The observations will be compared with recent hydrodynamic simulations of ring galaxies.
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