Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-12-19
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
12 pages. 7 Figures. 2 Tables. Submitted to MNRAS
Scientific paper
We present a catalogue of 39 multiple-mergers found using the mergers catalogue of the Galaxy Zoo project for $z<0.1$ and compare them to corresponding semi-analytical galaxies from the Millennium Simulation. We estimate the (volume-limited) multi-merger fraction of the local Universe using our sample and find it to be at least two orders of magnitude less than binary-mergers - in good agreement with the simulations (especially the Munich group). We then investigate the properties of galaxies in binary- and multi-mergers (morphologies, colours, stellar masses and environment) and compare these results with those predicted by the semi-analytical galaxies. We find that multi-mergers favour galaxies with properties typical of elliptical morphologies and that this is in qualitative agreement with the models. Studies of multi-mergers thus provide an independent (and largely corroborating) test of the Millennium semi-analytical models.
Bamford Steven
Darg Daniel W.
Kaviraj Sugata
Lintott Chris J.
Lynn Stuart
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