Abstract
Over the past two decades, our perception of galactic collisions and mergers has changed dramatically: once thought to be interesting but rare events, they are now perceived as some of the dominant processes governing galaxy formation and evolution. I shall first briefly review the early history of the subject and our recent progress in understanding the six main types of galactic collisions. Then I shall focus on three issues: (1) the fascinating parallels that exist between the 1 Gyr old merger remnant NGC7252 and elliptical galaxies; (2) what new light the study of young (≲100 Myr) and old (≳ Gyr) starbursts is shedding on the formation of E and SO galaxies; and (3) the still fragmentary, but growing, evidence that even the bulges of disk galaxies may have formed through mergers. As we shall see, it now seems likely that the present position of a galaxy in Hubble’s morphological sequence was determined mainly by the number and severity of mergers in its past history.
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Schweizer, F. (1990). Interactions in Our Time. In: Wielen, R. (eds) Dynamics and Interactions of Galaxies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75273-5_10
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