The APOSTLE simulations : solutions to the Local Group's cosmic puzzles

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Sawala , T , Frenk , C S , Fattahi , A , Navarro , J F , Bower , R G , Crain , R A , Dalla Vecchia , C , Furlong , M , Helly , J C , Jenkins , A , Oman , K A , Schaller , M , Schaye , J , Theuns , T , Trayford , J & White , S D M 2016 , ' The APOSTLE simulations : solutions to the Local Group's cosmic puzzles ' Monthly Notices of the Royal Astronomical Society , vol. 457 , no. 2 , pp. 1931-1943 . DOI: 10.1093/mnras/stw145

Title: The APOSTLE simulations : solutions to the Local Group's cosmic puzzles
Author: Sawala, Till; Frenk, Carlos S.; Fattahi, Azadeh; Navarro, Julio F.; Bower, Richard G.; Crain, Robert A.; Dalla Vecchia, Claudio; Furlong, Michelle; Helly, John. C.; Jenkins, Adrian; Oman, Kyle A.; Schaller, Matthieu; Schaye, Joop; Theuns, Tom; Trayford, James; White, Simon D. M.
Contributor: University of Helsinki, Particle Physics and Astrophysics
Date: 2016-04-01
Language: eng
Number of pages: 13
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/190444
Abstract: The Local Group galaxies offer some of the most discriminating tests of models of cosmic structure formation. For example, observations of the Milky Way (MW) and Andromeda satellite populations appear to be in disagreement with N-body simulations of the 'lambda cold dark matter' (I > CDM) model: there are far fewer satellite galaxies than substructures in CDM haloes (the 'missing satellites' problem); dwarf galaxies seem to avoid the most massive substructures (the 'too-big-to-fail' problem); and the brightest satellites appear to orbit their host galaxies on a thin plane (the 'planes of satellites' problem). Here we present results from apostle (A Project Of Simulating The Local Environment), a suite of cosmological hydrodynamic simulations of 12 volumes selected to match the kinematics of the Local Group (LG) members. Applying the eagle code to the LG environment, we find that our simulations match the observed abundance of LG galaxies, including the satellite galaxies of the MW and Andromeda. Due to changes to the structure of haloes and the evolution in the LG environment, the simulations reproduce the observed relation between stellar mass and velocity dispersion of individual dwarf spheroidal galaxies without necessitating the formation of cores in their dark matter profiles. Satellite systems form with a range of spatial anisotropies, including one similar to the MWs, confirming that such a configuration is not unexpected in I > CDM. Finally, based on the observed velocity dispersion, size, and stellar mass, we provide estimates of the maximum circular velocity for the haloes of nine MW dwarf spheroidals.
Subject: galaxies: evolution
galaxies: formation
cosmology: theory
COLD DARK-MATTER
MILKY-WAY SATELLITES
DWARF GALAXIES
EAGLE SIMULATIONS
LAMBDA-CDM
COSMOLOGICAL SIMULATIONS
INITIAL CONDITIONS
HALOES
MASS
EVOLUTION
115 Astronomy, Space science
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