The effects of LMC-mass environments on their dwarf satellite galaxies in the FIRE simulations

• Main Authors: Boylan-Kolchin, M. (Author), Bullock, J.S (Author), El-Badry, K. (Author), Jahn, E.D (Author), Sales, L.V (Author), Samuel, J. (Author), Wetzel, A. (Author)
• Format: Article
• Language: English
• Published: Oxford University Press 2022
• Subjects: Dwarf satellites; Galaxies; galaxies: dwarf; Galaxies: dwarf; galaxies: evolution; galaxies: formation; galaxies: star formation; Galaxies: star formation; Galaxy evolution; Galaxy formations; Large magellanic clouds; Local Group; Local groups; Orbits; Quenching; Quenching time; Realistic environments; Satellites; Stars; Stellar mass
• Online Access: View Fulltext in Publisher

 Characterizing the predicted environments of dwarf galaxies like the Large Magellanic Cloud (LMC) is becoming increasingly important as next-generation surveys push sensitivity limits into this low-mass regime at cosmological distances. We study the environmental effects of LMC-mass haloes (M200m ∼1011 M⊙) on their populations of satellites (M∗ ≥ 104 M⊙) using a suite of zoom-in simulations from the Feedback In Realistic Environments (FIRE) project. Our simulations predict significant hot coronas with T ∼105 K and Mgas ∼109.5 M⊙. We identify signatures of environmental quenching in dwarf satellite galaxies, particularly for satellites with intermediate mass (M∗ = 106-107 M⊙). The gas content of such objects indicates ram pressure as the likely quenching mechanism, sometimes aided by star formation feedback. Satellites of LMC-mass hosts replicate the stellar mass dependence of the quiescent fraction found in satellites of Milky Way-mass hosts (i.e. that the quiescent fraction increases as stellar mass decreases). Satellites of LMC-mass hosts have a wider variety of quenching times when compared to the strongly bimodal distribution of quenching times of nearby centrals. Finally, we identify significant tidal stellar structures around four of our six LMC analogues, suggesting that stellar streams may be common. These tidal features originated from satellites on close orbits, extend to ∼80 kpc from the central galaxy, and contain ∼106-107 M⊙ of stars. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.