The evolution of dwarf galaxy satellites with different dark matter density profiles in the ErisMod simulations. I. The early infalls

Abstract

We present the first simulations of tidal stirring of dwarf galaxies in the Local Group carried out in a cosmological context. We use the ErisDARK simulation of a MW-sized galaxy to identify some of the most massive subhalos ($M_{vir}>10^8{M}_{\odot }$) that fall into the main host before $z=2$. Subhalos are replaced before infall with high-resolution models of dwarf galaxies comprising a faint stellar disk embedded in a dark matter halo. The set of models contains cuspy halos as well as halos with "cored" profiles (with asymptotic inner slope $\gamma =0.6$). The simulations are then run to $z=0$ with as many as 54 million particles and resolution as small as $\sim 4$ pc using the N-Body code ChaNGa. The stellar components of all satellites are significantly affected by tidal stirring, losing stellar mass and undergoing a morphological transformation towards a pressure supported spheroidal system. However, while some remnants with cuspy halos maintain significant rotational flattening and disk-like features, all the shallow halo models achieve $v/\sigma <0.5$ and round shapes typical of dSph satellites of the MW and M31. Mass loss is also enhanced in the latter, and remnants can reach luminosities and velocity dispersions as low as those of Ultra Faint Dwarfs (UFDs). We argue that cuspy progenitors must be the exception rather than the rule among satellites of the MW since all the MW and M31 satellites in the luminosity range of our remnants are dSphs, a result matched only in the simulation with "cored" models.

References in corpus (57)

• Dwarf Galaxies of the Local Group
• Statistical Properties of X-ray Clusters: Analytic and Numerical Comparisons
• The Average Star Formation Histories of Galaxies in Dark Matter Halos from z=0-8
• The observed properties of dwarf galaxies in and around the Local Group
• At the heart of the matter: the origin of bulgeless dwarf galaxies and Dark Matter cores
• Halos and galaxies in the standard cosmological model: results from the Bolshoi simulation
• Ahf: Amiga's Halo Finder
• How supernova feedback turns dark matter cusps into cores
• Accurate masses for dispersion-supported galaxies
• Cuspy No More: How Outflows Affect the Central Dark Matter and Baryon Distribution in Lambda CDM Galaxies
• Formation and evolution of galaxy dark matter halos and their substructure
• Forming Realistic Late-Type Spirals in a LCDM Universe: The Eris Simulation
• The unexpected diversity of dwarf galaxy rotation curves
• The Atlas3D project - VII. A new look at the morphology of nearby galaxies: the kinematic morphology-density relation
• Simultaneous ram pressure and tidal stripping; how dwarf spheroidals lost their gas
• Rotation-Dependent Catastrophic Disruption of Gravitational Aggregates
• Cusp-core transformations in dwarf galaxies: observational predictions
• Dependence of the outer density profiles of halos on their mass accretion rate
• The Tidal Evolution of Local Group Dwarf Spheroidals
• Forged in FIRE: cusps, cores, and baryons in low-mass dwarf galaxies
• The Metamorphosis of Tidally Stirred Dwarf Galaxies
• Inside Out and Upside Down: Tracing the Assembly of a Simulated Disk Galaxy Using Mono-Age Stellar Populations
• Tidal stirring and the origin of dwarf spheroidals in the Local Group
• The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies
• Equilibrium Disk-Bulge-Halo Models for the Milky Way and Andromeda Galaxies
• The coupling between the core/cusp and missing satellite problems
• A Baryonic Solution to the Missing Satellites Problem
• Morphological evolution of disk galaxies in clusters
• Substructure depletion in the Milky Way halo by the disk
• The rotation curves shapes of late-type dwarf galaxies
• Dynamical friction and the evolution of satellites in virialized halos: the theory of linear response
• Dynamical Blueprints for Galaxies
• Virgo cluster early-type dwarf galaxies with the Sloan Digital Sky Survey. I. On the possible disk nature of bright early-type dwarfs
• The Baryon Cycle of Dwarf Galaxies: Dark, Bursty, Gas-Rich Polluters
• Early Gas Stripping as the Origin of the Darkest Galaxies in the Universe
• On the Efficiency of the Tidal Stirring Mechanism for the Origin of Dwarf Spheroidals: Dependence on the Orbital and Structural Parameters of the Progenitor Disky Dwarfs
• On the Destruction and Over-Merging of Dark Halos in Dissipationless N-body Simulations
• Measuring Mass Loss Rates from Galactic Satellites
• The Primeval Populations of the Ultra-Faint Dwarf Galaxies
• Cosmic Reionization On Computers II. Reionization History and Its Back Reaction on Early Galaxies
• Tidal debris of dwarf spheroidals as a probe of structure formation models
• Mass modelling of dwarf spheroidal galaxies: the effect of unbound stars from tidal tails and the Milky Way
• The evolution of substructure II: linking dynamics to environment
• The Distribution of Dark Matter in the Milky Way's Disk
• Life at the Periphery of the Local Group: the kinematics of the Tucana Dwarf Galaxy
• Pseudobulge Formation as a Dynamical Rather than a Secular Process
• The ACS LCID project. X. The Star Formation History of IC 1613: Revisiting the Over-Cooling Problem
• On the morphologies, gas fractions, and star formation rates of small galaxies
• Low-mass galaxy assembly in simulations: regulation of early star formation by radiation from massive stars
• An Off-center Density Peak in the Milky Way's Dark Matter Halo?
• A "Light," Centrally-Concentrated Milky Way Halo?
• Size matters: the non-universal density profile of subhaloes in SPH simulations and implications for the Milky Way's dSphs
• Tidal Stirring of Disky Dwarfs with Shallow Dark Matter Density Profiles: Enhanced Transformation into Dwarf Spheroidals
• Formation of Dwarf Spheroidal Galaxies Via Mergers of Disky Dwarfs
• How to make an ultra-faint dwarf spheroidal galaxy: tidal stirring of disky dwarfs with shallow dark matter density profiles
• Reversal of Fortune: Increased Star Formation Efficiencies in the Early Histories of Dwarf Galaxies?
• The First Galaxies and the Likely Discovery of their Fossils in the Local Group

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• Cold gas stripping in satellite galaxies: from pairs to clusters
• Contributions to the accreted stellar halo: an atlas of stellar deposition
• The Formation of Ultra-Diffuse Galaxies in Clusters
• Tidal stripping and the structure of dwarf galaxies in the Local Group
• The no-spin zone: rotation vs dispersion support in observed and simulated dwarf galaxies
• ELVES I: Structures of Dwarf Satellites of MW-like Galaxies; Morphology, Scaling Relations, and Intrinsic Shapes
• Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes). V. The Complete SMUDGes Catalog and the Nature of Ultra-Diffuse Galaxies
• The phase-space structure of tidally stripped halos
• The Effects of Ram-pressure Stripping and Supernova Winds on the Tidal Stirring of Disky Dwarfs: Enhanced Transformation into Dwarf Spheroidals
• On the stability of tidal streams in action space
• On the early evolution of Local Group dwarf galaxy types: star formation and supernova feedback
• Tidal stirring of satellites with shallow density profiles prevents them from being too big to fail
• Tidal features of classical Milky Way satellites in a $\Lambda$CDM universe
• The ACS LCID Project XI. On the early time resolution of LG dwarf galaxy SFHs: Comparing the effects of reionization in models with observations
• Constraining the nature of dark matter with the star formation history of the faintest Local Group dwarf galaxy satellites
• Trial by FIRE: Probing the dark matter density profile of dwarf galaxies with GraphNPE
• Too small to succeed: the difficulty of sustaining star formation in low-mass haloes
• Constraining the shape of Milky Way satellites with distance gradients