Galaxy Zoo: multimergers and the Millennium Simulation

D. W. Darg; Sugata Kaviraj; Chris J. Lintott; Kevin Schawinski; Joseph Silk; Stuart Lynn; Steven P. Bamford; Bob Nichol

doi:10.1111/j.1365-2966.2011.18964.x

Galaxy Zoo: multimergers and the Millennium Simulation

D. W. Darg, Sugata Kaviraj, Chris J. Lintott, Kevin Schawinski, Joseph Silk, Stuart Lynn, Steven P. Bamford, Bob Nichol

Institute of Cosmology & Gravitation

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Abstract

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) multimerger fraction of the local Universe using our sample and find it to be at least 2 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 mergers and multimergers (morphologies, colours, stellar masses and environment) and compare these results with those predicted by the semi-analytical galaxies. We find that multimergers favour galaxies with properties typical of elliptical morphologies and that this is in qualitative agreement with the models. Studies of multimergers thus provide an independent (and largely corroborating) test of the Millennium semi-analytical models.

Original language	English
Pages (from-to)	1745-1755
Journal	Monthly Notices of the Royal Astronomical Society
Volume	416
Issue number	3
DOIs	https://doi.org/10.1111/j.1365-2966.2011.18964.x
Publication status	Published - Sept 2011

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title = "Galaxy Zoo: multimergers and the Millennium Simulation",

abstract = "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) multimerger fraction of the local Universe using our sample and find it to be at least 2 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 mergers and multimergers (morphologies, colours, stellar masses and environment) and compare these results with those predicted by the semi-analytical galaxies. We find that multimergers favour galaxies with properties typical of elliptical morphologies and that this is in qualitative agreement with the models. Studies of multimergers thus provide an independent (and largely corroborating) test of the Millennium semi-analytical models.",

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T2 - multimergers and the Millennium Simulation

AU - Darg, D. W.

AU - Kaviraj, Sugata

AU - Lintott, Chris J.

AU - Schawinski, Kevin

AU - Silk, Joseph

AU - Lynn, Stuart

AU - Bamford, Steven P.

AU - Nichol, Bob

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AB - 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) multimerger fraction of the local Universe using our sample and find it to be at least 2 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 mergers and multimergers (morphologies, colours, stellar masses and environment) and compare these results with those predicted by the semi-analytical galaxies. We find that multimergers favour galaxies with properties typical of elliptical morphologies and that this is in qualitative agreement with the models. Studies of multimergers thus provide an independent (and largely corroborating) test of the Millennium semi-analytical models.

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DO - 10.1111/j.1365-2966.2011.18964.x

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JF - Monthly Notices of the Royal Astronomical Society

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Galaxy Zoo: multimergers and the Millennium Simulation

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