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Overview: Low-z Observations: Of Interacting and Merging Galaxies

Published online by Cambridge University Press:  25 May 2016

Francois Schweizer*
Affiliation:
Carnegie Institution of Washington, Department of Terrestrial Magnetism, Washington, DC 20015, USA

Abstract

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Gravitational interactions and mergers affect the morphologies and dynamics of galaxies from our Local Group to the limits of the observable universe. Observations of interacting galaxies at low redshifts (z ≲ 0.2) yield detailed information about many of the processes at work. I briefly review these processes and the growing evidence that mergers play a major role in the delayed formation of elliptical and early-type disk galaxies both in the field and in clusters. Low-z observations clearly contradict the notion of a single epoch of E formation at z ≳ 2; instead, E and S0 galaxies continue forming to the present. The different rates of E and S0 formation inferred from observations of distant and nearby clusters may partially reflect the dependence of dynamical friction on mass: Major, E-forming mergers may tend to occur earlier than minor, S0-forming mergers because the dynamical friction is strongest for equal-mass galaxies.

Type
Overview
Copyright
Copyright © Kluwer 1999 

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