The edge of galaxy formation - II. Evolution of Milky Way satellite analogues after infall

Jonas Frings, Andrea Maccio, Tobias Buck, Camilla Penzo, Aaron Dutton, Marvin Blank, Aura Obreja

    Research output: Contribution to journalArticle

    Abstract

    In the first paper, we presented 27 hydrodynamical cosmological simulations of galaxies with total masses between 5 × 108 and 1010 M. In this second paper, we use a subset of these cosmological simulations as initial conditions (ICs) for more than 40 hydrodynamical simulations of satellite and host galaxy interaction. Our cosmological ICs seem to suggest that galaxies on these mass scales have very little rotational support and are velocity dispersion (σ) dominated. Accretion and environmental effects increase the scatter in the galaxy scaling relations (e.g. size-velocity dispersion) in very good agreement with observations. Star formation is substantially quenched after accretion. Mass removal due to tidal forces has several effects: it creates a very flat stellar velocity dispersion profile, and it reduces the dark matter content at all scales (even in the centre), which in turn lowers the stellar velocity on scales around 0.5 kpc even when the galaxy does not lose stellar mass. Satellites which start with a cored dark matter profile are more prone to either be destroyed or to end up in a very dark matter poor galaxy. Finally, we found that tidal effects always increase the 'cuspyness' of the dark matter profile, even for haloes that infall with a core.

    Original languageEnglish (US)
    Pages (from-to)3378-3389
    Number of pages12
    JournalMonthly Notices of the Royal Astronomical Society
    Volume472
    Issue number3
    DOIs
    StatePublished - Jan 1 2017

    Fingerprint

    galactic evolution
    analogs
    galaxies
    dark matter
    accretion
    simulation
    profiles
    interacting galaxies
    environmental effect
    stellar mass
    set theory
    star formation
    halos
    scaling
    effect

    Keywords

    • Cosmology: theory
    • Dark matter
    • Galaxies: formation
    • Galaxies: kinematics and dynamics
    • Methods: numerical

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    The edge of galaxy formation - II. Evolution of Milky Way satellite analogues after infall. / Frings, Jonas; Maccio, Andrea; Buck, Tobias; Penzo, Camilla; Dutton, Aaron; Blank, Marvin; Obreja, Aura.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 472, No. 3, 01.01.2017, p. 3378-3389.

    Research output: Contribution to journalArticle

    Frings, Jonas ; Maccio, Andrea ; Buck, Tobias ; Penzo, Camilla ; Dutton, Aaron ; Blank, Marvin ; Obreja, Aura. / The edge of galaxy formation - II. Evolution of Milky Way satellite analogues after infall. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 472, No. 3. pp. 3378-3389.
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