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Angular momentum evolution of galaxies in EAGLE

Lagos, C. d. P.; Theuns, T.; Stevens, A.R.H.; Cortese, L.; Padilla, N.D.; Davis, T.A.; Contreras, S.; Croton, D.

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C. d. P. Lagos

A.R.H. Stevens

L. Cortese

N.D. Padilla

T.A. Davis

S. Contreras

D. Croton


We use the EAGLE cosmological hydrodynamic simulation suite to study the specific angular momentum of galaxies, j, with the aims of (i) investigating the physical causes behind the wide range of j at fixed mass and (ii) examining whether simple, theoretical models can explain the seemingly complex and non-linear nature of the evolution of j. We find that j of the stars, jstars, and baryons, jbar, are strongly correlated with stellar and baryon mass, respectively, with the scatter being highly correlated with morphological proxies such as gas fraction, stellar concentration, (u−r) intrinsic colour, stellar age and the ratio of circular velocity to velocity dispersion. We compare with available observations at z = 0 and find excellent agreement. We find that jbar follows the theoretical expectation of an isothermal collapsing halo under conservation of specific angular momentum to within ≈50 per cent, while the subsample of rotation-supported galaxies are equally well described by a simple model in which the disc angular momentum is just enough to maintain marginally stable discs. We extracted evolutionary tracks of the stellar spin parameter of EAGLE galaxies and found that the fate of their jstars at z = 0 depends sensitively on their star formation and merger histories. From these tracks, we identified two distinct physical channels behind low jstars galaxies at z = 0: (i) galaxy mergers, and (ii) early star formation quenching. The latter can produce galaxies with low jstars and early-type morphologies even in the absence of mergers.


Lagos, C. D. P., Theuns, T., Stevens, A., Cortese, L., Padilla, N., Davis, T., …Croton, D. (2017). Angular momentum evolution of galaxies in EAGLE. Monthly Notices of the Royal Astronomical Society, 464(4), 3850-3870.

Journal Article Type Article
Acceptance Date Oct 10, 2016
Online Publication Date Nov 7, 2016
Publication Date Feb 1, 2017
Deposit Date Feb 27, 2017
Publicly Available Date Mar 2, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 464
Issue 4
Pages 3850-3870


Published Journal Article (4.7 Mb)

Copyright 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.

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