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The relation between galaxy morphology and colour in the EAGLE simulation.

Correa, Camila A. and Schaye, Joop and Clauwens, Bart and Bower, Richard G. and Crain, Robert A. and Schaller, Matthieu and Theuns, Tom and Thob, Adrien C. R. (2017) 'The relation between galaxy morphology and colour in the EAGLE simulation.', Monthly notices of the Royal Astronomical Society : letters., 472 (1). L45-L49.


We investigate the relation between kinematic morphology, intrinsic colour and stellar mass of galaxies in the EAGLE cosmological hydrodynamical simulation. We calculate the intrinsic u − r colours and measure the fraction of kinetic energy invested in ordered corotation of 3562 galaxies at z = 0 with stellar masses larger than 1010 M⊙. Inspection of gri-composite images suggests that the kinematic morphology is a useful proxy for visual morphology. EAGLE produces a galaxy population for which morphology is tightly correlated with the location in the colour–mass diagram, with the red sequence mostly populated by elliptical galaxies and the blue cloud by disc galaxies. Satellite galaxies are more likely to be on the red sequence than centrals, and for satellites the red sequence is morphologically more diverse. These results show that the connection between mass, intrinsic colour and morphology arises from galaxy-formation models that reproduce the observed galaxy mass function and sizes.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:18 August 2017
Date deposited:08 March 2018
Date of first online publication:23 August 2017
Date first made open access:08 March 2018

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