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The link between the assembly of the inner dark matter halo and the angular momentum evolution of galaxies in the EAGLE simulation.

Zavala, J. and Frenk, C. S. and Bower, R. and Schaye, J. and Theuns, T. and Crain, R. A. and Trayford, J. W. and Schaller, M. and Furlong, M. (2016) 'The link between the assembly of the inner dark matter halo and the angular momentum evolution of galaxies in the EAGLE simulation.', Monthly notices of the Royal Astronomical Society., 460 (4). pp. 4466-4482.


We explore the co-evolution of the specific angular momentum of dark matter haloes and the cold baryons that comprise the galaxies within. We study over 2000 galaxies within the reference cosmological hydrodynamical simulation of the ‘Evolution and Assembly of GaLaxies and their Environments’ (EAGLE) project. We employ a methodology within which the evolutionary history of a system is specified by the time-evolving properties of the Lagrangian particles that define it at z = 0. We find a strong correlation between the evolution of the specific angular momentum of today's stars (cold gas) and that of the inner (whole) dark matter halo they are associated with. This link is particularly strong for the stars formed before the epoch of maximum expansion and subsequent collapse of the central dark matter halo (turnaround). Spheroids are assembled primarily from stars formed prior to turnaround, and suffer a net loss of angular momentum associated with the strong merging activity during the assembly of the inner dark matter halo. Stellar discs retain their specific angular momentum since they are comprised of stars formed mainly after turnaround, from gas that mostly preserves the high specific angular momentum it acquired by tidal torques during the linear growth of the halo. Since the specific angular momentum loss of the stars is tied to the galaxy's morphology today, it may be possible to use our results to predict, statistically, the maximum loss of specific angular momentum of the inner part of a halo given the morphology of the galaxy it hosts

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Publisher statement:This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:26 May 2016
Date deposited:06 October 2016
Date of first online publication:30 May 2016
Date first made open access:06 October 2016

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