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Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation

Shao, S.; Cautun, M.; Deason, A.J.; Frenk, C.S.; Theuns, T.

Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation Thumbnail


S. Shao

M. Cautun


We investigate the population of dwarf galaxies with stellar masses similar to the Large Magellanic Cloud (LMC) and M33 in the EAGLE galaxy formation simulation. In the field, galaxies reside in haloes with stellar-to-halo mass ratios of 1.03+0.50−0.31×10−2 (68 per cent confidence level); systems like the LMC, which have an SMC-mass satellite, reside in haloes about 1.3 times more massive, which suggests an LMC halo mass at infall, M200=3.4+1.8−1.2×1011M⊙ (68 per cent confidence level). The colour distribution of dwarfs is bimodal, with the red galaxies (g − r > 0.6) being mostly satellites. The fraction of red LMC-mass dwarfs is 15 per cent for centrals, and for satellites this fraction increases rapidly with host mass: from 10 per cent for satellites of Milky Way (MW)-mass haloes to nearly 90 per cent for satellites of groups and clusters. The quenching timescale, defined as the time after infall when half of the satellites have acquired red colours, decreases with host mass from >5 Gyr for MW-mass hosts to 2.5 Gyr for cluster mass hosts. The satellites of MW-mass haloes have higher star formation rates and bluer colours than field galaxies. This is due to enhanced star formation triggered by gas compression shortly after accretion. Both the LMC and M33 have enhanced recent star formation that could be a manifestation of this process. After infall into their MW-mass hosts, the g − r colours of LMC-mass dwarfs become bluer for the first 2 Gyr, after which they rapidly redden. LMC-mass dwarfs fell into their MW-mass hosts only relatively recently, with more than half having an infall time of less than 3.5 Gyr.


Shao, S., Cautun, M., Deason, A., Frenk, C., & Theuns, T. (2018). Evolution of LMC/M33-mass dwarf galaxies in the EAGLE simulation. Monthly Notices of the Royal Astronomical Society, 479(1), 284-296.

Journal Article Type Article
Acceptance Date Jun 1, 2018
Online Publication Date Jun 6, 2018
Publication Date Sep 1, 2018
Deposit Date Jul 11, 2018
Publicly Available Date Jul 12, 2018
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 479
Issue 1
Pages 284-296


Published Journal Article (1.4 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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