The APOSTLE project : Local Group kinematic mass constraints and simulation candidate selection

Show full item record



Permalink

http://hdl.handle.net/10138/190446

Citation

Fattahi , A , Navarro , J F , Sawala , T , Frenk , C S , Oman , K A , Crain , R A , Furlong , M , Schaller , M , Schaye , J , Theuns , T & Jenkins , A 2016 , ' The APOSTLE project : Local Group kinematic mass constraints and simulation candidate selection ' Monthly Notices of the Royal Astronomical Society , vol. 457 , no. 1 , pp. 844-856 . DOI: 10.1093/mnras/stv2970

Title: The APOSTLE project : Local Group kinematic mass constraints and simulation candidate selection
Author: Fattahi, Azadeh; Navarro, Julio F.; Sawala, Till; Frenk, Carlos S.; Oman, Kyle A.; Crain, Robert A.; Furlong, Michelle; Schaller, Matthieu; Schaye, Joop; Theuns, Tom; Jenkins, Adrian
Contributor: University of Helsinki, Particle Physics and Astrophysics
Date: 2016-03-21
Language: eng
Number of pages: 13
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/190446
Abstract: We use a large sample of isolated dark matter halo pairs drawn from cosmological N-body simulations to identify candidate systems whose kinematics match that of the Local Group (LG) of galaxies. We find, in agreement with the 'timing argument' and earlier work, that the separation and approach velocity of the Milky Way (MW) and Andromeda (M31) galaxies favour a total mass for the pair of similar to 5 x 10(12) M-circle dot. A mass this large, however, is difficult to reconcile with the small relative tangential velocity of the pair, as well as with the small deceleration from the Hubble flow observed for the most distant LG members. Halo pairs that match these three criteria have average masses a factor of similar to 2 times smaller than suggested by the timing argument, but with large dispersion. Guided by these results, we have selected 12 halo pairs with total mass in the range 1.6-3.6 x 10(12) M-circle dot for the APOSTLE project (A Project Of Simulating The Local Environment), a suite of hydrodynamical resimulations at various numerical resolution levels (reaching up to similar to 10(4) M-circle dot per gas particle) that use the subgrid physics developed for the EAGLE project. These simulations reproduce, by construction, the main kinematics of the MW-M31 pair, and produce satellite populations whose overall number, luminosities, and kinematics are in good agreement with observations of the MW and M31 companions. The APOSTLE candidate systems thus provide an excellent testbed to confront directly many of the predictions of the Lambda cold dark matter cosmology with observations of our local Universe.
Subject: methods: numerical
galaxies: dwarf
galaxies: haloes
Local Group
dark matter
DARK-MATTER HALO
LARGE-MAGELLANIC-CLOUD
MILKY-WAY
DENSITY PROFILE
INITIAL CONDITIONS
GALAXY FORMATION
NEARBY GALAXIES
VELOCITY-FIELD
UNIVERSE
EVOLUTION
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
stv2970.pdf 1.709Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record