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Collisional Ring Galaxies in Small Groups

Published online by Cambridge University Press:  12 April 2016

C. Horellou
C. Horellou*
Affiliation:
Onsala Space Observatory, Chalmers University of Technology, S-439 92 Onsala, Sweden

Abstract

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The probability of plunging orbits is enhanced in groups of galaxies and indeed, observations show that ring galaxies, which are believed to form when a galaxy passes through the center of a larger rotating disk, are often found in small groups. Numerical simulations combined with a knowledge of the large-scale H I distribution provide strong constraints on the dynamical history of these systems and on the identity of the intruder. Here we present a numerical model of the Cartwheel galaxy which supports the suggestion that the most distant companion is the intruder. We also present high-resolution H I observations of the more irregular system Arp 119 that reveal a possible connection to the most distant companion.

Type
Part 3. Numerical Simulations
Information
International Astronomical Union Colloquium , Volume 174: Small Galaxy Groups , 2000 , pp. 277 - 280
Copyright
Copyright © Astronomical Society of the Pacific 2000

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