Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-20
Astron.Astrophys.401:817-834,2003
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A. 20 pages, 14 figures. The resolution of several figures has been reduced in this version
Scientific paper
10.1051/0004-6361:20030150
Polar ring galaxies are peculiar systems in which a gas rich, nearly polar ring surrounds an early-type or elliptical host galaxy. Two formation scenarios for these objects have been proposed: they are thought to form either in major galaxy mergers or by tidal accretion of the polar material from a gas rich donor galaxy. Both scenarios are studied through N-body simulations including gas dynamics and star formation. Constraints on physical parameters are drawn out, in order to determine which scenario is the most likely to occur. Polar ring galaxies from each scenario are compared with observations and we discuss whether the accretion scenario and the merging scenario account for observational properties of polar ring galaxies. The conclusion of this study is that the accretion scenario is both the most likely and the most supported by observations. Even if the merging scenario is rather robust, most polar ring galaxies are shown to be the result of tidal gas accretion events.
Bournaud Frederic
Combes François
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