The relation between galaxy morphology and colour in the EAGLE simulation

Correa, Camila A.; Schaye, Joop; Clauwens, Bart; Bower, Richard G.; Crain, Robert A.; Schaller, Matthieu; Theuns, Tom; Thob, Adrien C.R.

doi:10.1093/mnrasl/slx133

The relation between galaxy morphology and colour in the EAGLE simulation

Correa, Camila A.; Schaye, Joop; Clauwens, Bart; Bower, Richard G.; Crain, Robert A.; Schaller, Matthieu; Theuns, Tom; Thob, Adrien C.R.

Authors

Camila A. Correa

Joop Schaye

Bart Clauwens

Richard G. Bower

Robert A. Crain

Dr Matthieu Schaller matthieu.schaller@durham.ac.uk
Academic Visitor

Professor Tom Theuns tom.theuns@durham.ac.uk
Professor

Adrien C.R. Thob

Abstract

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.

Citation

Correa, C. A., Schaye, J., Clauwens, B., Bower, R. G., Crain, R. A., Schaller, M., …Thob, A. C. (2017). The relation between galaxy morphology and colour in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society: Letters, 472(1), L45-L49. https://doi.org/10.1093/mnrasl/slx133

Journal Article Type	Article
Acceptance Date	Aug 18, 2017
Online Publication Date	Aug 23, 2017
Publication Date	Nov 21, 2017
Deposit Date	Mar 8, 2018
Publicly Available Date	Mar 8, 2018
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN	1745-3933
Publisher	Oxford University Press
Peer Reviewed	Peer Reviewed
Volume	472
Issue	1
Pages	L45-L49
DOI	https://doi.org/10.1093/mnrasl/slx133

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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.