The abundance of satellite galaxies in the inner region of $\Lambda$CDM Milky Way sized haloes

Abstract

The concordance $\Lambda$CDM cosmology predicts tens of satellite galaxies distributed in the inner region ($<40\ \lkpc$) of the Milky Way (MW), yet at most $12$ were discovered at present day, including 3 discovered very recently by Dark Energy Survey (DES) and 5 from other surveys (e.g. PanSTARRS, MagLiteS). We use $5$ ultra-high resolution simulations of MW sized dark matter haloes from the $\aqua$ project, combined with $\galf$ semi-analytical galaxy formation model, to investigate properties of the model satellite galaxy population inside $40\ \lkpc$ of MW sized haloes. On average, in each halo this model predicts about $20$ inner satellite galaxies, among them $5$ are comparable to the classic satellites in the luminosity, these are in stark contrast to the corresponding numbers in observations. We further investigate the survivability of these model inner satellites in the presence of a central stellar disk with a set of ideal simulations. These are done by re-evolving a quarter (30) of the whole $\aqua$ inner satellite galaxies (121) by including a static disk potential in addition to the MW halo. Our finding is that the additional disk completely disrupt 40 percents of these satellites and results in $14$ satellite galaxies within the $40\ \lkpc$ of each $\aqua$ at the end, in reasonably well agreement with observations.

arXiv comment8 pages, 4 figures. Submitted to MNRAS

References in corpus (54)

• The Structure of Cold Dark Matter Halos
• The cosmological simulation code GADGET-2
• Dark Matter Substructure in Galactic Halos
• Where are the missing galactic satellites?
• Populating a cluster of galaxies - I. Results at z=0
• The broken hierarchy of galaxy formation
• The Aquarius Project: the subhalos of galactic halos
• The observed properties of dwarf galaxies in and around the Local Group
• Planck 2013 results. I. Overview of products and scientific results
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Dark matter halo concentrations in the Wilkinson Microwave Anisotropy Probe year 5 cosmology
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• The Core-Cusp Problem
• The Milky Way's bright satellites as an apparent failure of LCDM
• A Method for Measuring (Slopes of) the Mass Profiles of Dwarf Spheroidal Galaxies
• Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy
• The APOSTLE simulations: solutions to the Local Group's cosmic puzzles
• Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
• The Observed properties of Dark Matter on small spatial scales
• Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
• High-resolution mass models of dwarf galaxies from LITTLE THINGS
• The Luminosity Function of the Milky Way Satellites
• Not so lumpy after all: modeling the depletion of dark matter subhalos by Milky Way-like galaxies
• High-Resolution Measurements of the Halos of Four Dark Matter-Dominated Galaxies: Deviations from a Universal Density Profile
• Density Profiles of Cold Dark Matter Substructure: Implications for the Missing Satellites Problem
• The impact of dark matter cusps and cores on the satellite galaxy population around spiral galaxies
• Generating Equilibrium Dark Matter Halos: Inadequacies of the Local Maxwellian Approximation
• Sagittarius II, Draco II and Laevens 3: three new Milky Way satellites discovered in the Pan-STARRS 1 3pi Survey
• A quantitative explanation of the observed population of Milky Way satellite galaxies
• Substructure depletion in the Milky Way halo by the disk
• The upper bound on the lowest mass halo
• A Magellanic Origin of the DES Dwarfs
• A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3 pi Survey
• Kinematics and chemistry of recently discovered Reticulum 2 and Horologium 1 dwarf galaxies
• The population of Milky Way satellites in the LambdaCDM cosmology
• Kinematics of Milky Way Satellites in a Lambda Cold Dark Matter Universe
• Discovery of two neighboring satellites in the Carina constellation with MagLiteS
• Dwarf Galaxy Dark Matter Density Profiles Inferred from Stellar and Gas Kinematics
• Shaken and Stirred: The Milky Way's Dark Substructures
• Galaxy formation using halo merger histories taken from N-body simulations
• Statistics of Satellite Galaxies Around Milky Way-Like Hosts
• Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge
• Estimating the dark matter halo mass of our Milky Way using dynamical tracers
• The Mass Distribution and Assembly of the Milky Way from the Properties of the Magellanic Clouds
• A Robust Determination of Milky Way Satellite Properties using Hierarchical Mass Modeling
• The core-cusp problem: a matter of perspective
• The effect of a disc on the population of cuspy and cored dark matter substructures in Milky Way-like galaxies
• Modeling the Impact of Baryons on Subhalo Populations with Machine Learning
• A New Model for the Milky Way Bar
• The stability of stellar disks in Milky-Way sized dark matter halos
• The dependence of tidal stripping efficiency on the satellite and host galaxy morphology
• The earliest stars and their relics in the Milky Way
• The cold dark matter content of Galactic dwarf spheroidals: no cores, no failures, no problem
• The edge of galaxy formation II: evolution of Milky Way satellite analogues after infall

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