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Small-scale galaxy clustering in the eagle simulation.

Artale, M. Celeste and Pedrosa, Susana E. and Trayford, James W. and Theuns, Tom and Farrow, Daniel J. and Norberg, Peder and Zehavi, Idit and Bower, Richard G. and Schaller, Matthieu (2017) 'Small-scale galaxy clustering in the eagle simulation.', Monthly notices of the Royal Astronomical Society., 470 (2). pp. 1771-1787.


We study present-day galaxy clustering in the EAGLE cosmological hydrodynamical simulation. EAGLE’s galaxy formation parameters were calibrated to reproduce the redshift z = 0.1 galaxy stellar mass function, and the simulation also reproduces galaxy colours well. The simulation volume is too small to correctly sample large-scale fluctuations and we therefore concentrate on scales smaller than a few mega parsecs. We find very good agreement with observed clustering measurements from the Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by stellar mass, colour or luminosity. However, low-mass red galaxies are clustered too strongly, which is at least partly due to limited numerical resolution. Apart from this limitation, we conclude that EAGLE galaxies inhabit similar dark matter haloes as observed GAMA galaxies, and that the radial distribution of satellite galaxies, as a function of stellar mass and colour, is similar to that observed as well.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:19 May 2017
Date deposited:18 August 2017
Date of first online publication:23 May 2017
Date first made open access:18 August 2017

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