Tidal features of classical Milky Way satellites in a $\Lambda$CDM universe

Abstract

We use the APOSTLE cosmological hydrodynamic simulations to examine the effects of tidal stripping on cold dark matter (CDM) sub haloes that host three of the most luminous Milky Way (MW) dwarf satellite galaxies: Fornax, Sculptor, and Leo I. We identify simulated satellites that match the observed spatial and kinematic distributions of stars in these galaxies, and track their evolution after infall. We find $\sim$ 30$\%$ of subhaloes hosting satellites with present-day stellar mass $10^6$-$10^8$ $M_{\odot }$ experience $>20\%$ stellar mass loss after infall. Fornax analogues have earlier infall times compared to Sculptor and Leo I analogues. Star formation in Fornax analogues continues for $\sim 3$-$6$ Gyr after infall, whereas Sculptor and Leo I analogues stop forming stars $<2$-$3$ Gyr after infall. Fornax analogues typically show more significant stellar mass loss and exhibit stellar tidal tails, whereas Sculptor and Leo I analogues, which are more deeply embedded in their host DM haloes at infall, do not show substantial mass loss due to tides. When additionally comparing the orbital motion of the host subaloes to the measured proper motion of Fornax we find the matching more difficult; host subhaloes tend to have pericentres smaller than that measured for Fornax itself. From the kinematic and orbital data, we estimate that Fornax has lost $10-20\%$ of its infall stellar mass. Our best estimate for the surface brightness of a stellar tidal stream associated with Fornax is $\Sigma \sim$ 32.6 mag $\mathrm{arcse}{\mathrm{c}}^{-2}$, which may be detectable with deep imaging surveys such as DES and LSST.

15 pages, 12 figures, submitted to MNRAS

References in corpus (26)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• The Tidal Evolution of Local Group Dwarf Spheroidals
• The kinematic status and mass content of the Sculptor dwarf spheroidal galaxy
• The DART imaging and CaT survey of the Fornax Dwarf Spheroidal Galaxy
• Stellar Velocities in the Carina, Fornax, Sculptor and Sextans dSph Galaxies: Data from the Magellan/MMFS Survey
• The Velocity Dispersion Profile of the Remote Dwarf Spheroidal Galaxy Leo I: A Tidal Hit and Run?
• Exploring Halo Substructure with Giant Stars XI: The Tidal Tails of the Carina Dwarf Spheroidal and the Discovery of Magellanic Cloud Stars in the Carina Foreground
• Stellar kinematics and metallicities in the Leo I dwarf spheroidal galaxy -- wide field implications for galactic evolution
• Clean Kinematic Samples in Dwarf Spheroidals: An Algorithm for Evaluating Membership and Estimating Distribution Parameters When Contamination is Present
• The Space Motion of Leo I: Hubble Space Telescope Proper Motion and Implied Orbit
• Modeling The Structure And Dynamics of Dwarf Spheroidal Galaxies with Dark Matter And Tides
• The Star Formation Histories of Local Group Dwarf Galaxies III. Characterizing Quenching in Low-Mass Galaxies
• Mass modelling of dwarf spheroidal galaxies: the effect of unbound stars from tidal tails and the Milky Way
• Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. IV: Measurement for Sculptor
• Systemic Proper Motions of Milky Way Satellites from Stellar Redshifts: the Carina, Fornax, Sculptor and Sextans Dwarf Spheroidals
• Cosmological Simulations of Decaying Dark Matter: Implications for Small-scale Structure of Dark Matter Halos
• A Deep Survey of the Fornax dSph I: Star Formation History
• Enhanced tidal stripping of satellites in the galactic halo from dark matter self-interactions
• A PAndAS view of M31 dwarf elliptical satellites: NGC147 and NGC185
• Sailing under the Magellanic Clouds: A DECam View of the Carina Dwarf
• Galactic Tides and the Shape and Orientation of Dwarf Galaxy Satellites
• Stellar Substructures around the Hercules Dwarf Spheroidal Galaxy
• Improved photometry of SDSS crowded field images: Structure and dark matter content in the dwarf spheroidal galaxy Leo I

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• The morphology and structure of stellar populations in the Fornax dwarf spheroidal galaxy from Dark Energy Survey Data
• The survival of globular clusters in a cuspy Fornax
• Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies with Gaia EDR3
• Constraining neutrino-DM interactions with Milky Way dwarf spheroidals and supernova neutrinos
• Auriga Streams I: disrupting satellites surrounding Milky Way-mass haloes at multiple resolutions
• Universal subhalo accretion in cold and warm dark matter cosmologies
• Can tides explain the low dark matter density in Fornax?
• AuriDESI: Mock Catalogues for the DESI Milky Way Survey
• Dynamical Friction and Tidal Interactions
• The APOSTLE simulations: Rotation curves derived from synthetic 21-cm observations