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The ARTEMIS simulations: stellar haloes of Milky Way-mass galaxies

Font, A.S.; McCarthy, I.G.; Poole-Mckenzie, R.; Stafford, S.G.; Brown, S.T.; Schaye, J.; Crain, R.A.; Theuns, T.

The ARTEMIS simulations: stellar haloes of Milky Way-mass galaxies Thumbnail


A.S. Font

I.G. McCarthy

R. Poole-Mckenzie

S.G. Stafford

Shaun Brown
Post Doctoral Research Associate

J. Schaye

R.A. Crain


We introduce the Assembly of high-ResoluTion Eagle-simulations of MIlky Way-type galaxieS (ARTEMIS) simulations, a new set of 42 zoomed-in, high-resolution (baryon particle mass of ≈2×104M⊙h−1⁠), hydrodynamical simulations of galaxies residing in haloes of Milky Way mass, simulated with the EAGLE galaxy formation code with re-calibrated stellar feedback. In this study, we analyse the structure of stellar haloes, specifically the mass density, surface brightness, metallicity, colour, and age radial profiles, finding generally very good agreement with recent observations of local galaxies. The stellar density profiles are well fitted by broken power laws, with inner slopes of ≈−3, outer slopes of ≈−4, and break radii that are typically ≈20–40 kpc. The break radii generally mark the transition between in situ formation and accretion-driven formation of the halo. The metallicity, colour, and age profiles show mild large-scale gradients, particularly when spherically averaged or viewed along the major axes. Along the minor axes, however, the profiles are nearly flat, in agreement with observations. Overall, the structural properties can be understood by two factors: that in situ stars dominate the inner regions and that they reside in a spatially flattened distribution that is aligned with the disc. Observations targeting both the major and minor axes of galaxies are thus required to obtain a complete picture of stellar haloes.

Journal Article Type Article
Acceptance Date Aug 12, 2020
Online Publication Date Aug 17, 2020
Publication Date 2020-10
Deposit Date Oct 20, 2020
Publicly Available Date Oct 22, 2020
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 498
Issue 2
Pages 1765-1785
Public URL


Published Journal Article (2.4 Mb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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