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2011MNRAS.417.1434F - Mon. Not. R. Astron. Soc., 417, 1434-1443 (2011/October-3)
The dark matter assembly of the local group in constrained cosmological simulations of a Λ cold dark matter universe.
FORERO-ROMERO J.E., HOFFMAN Y., YEPES G., GOTTLOBER S., PIONTEK R., KLYPIN A. and STEINMETZ M.
Abstract (from CDS):
We find that the three LGs share a similar MAH with formation and last major merger epochs placed on average ≈ 10–12 Gyr ago. Between 12 and 17 per cent of the haloes in the mass range 5 {x} 1011 < Mh< 5 {x} 1012 h–1 M☉ have a similar MAH. In a set of pairs of haloes within the same mass range, a fraction of 1–3 per cent share similar formation properties as both haloes in the simulated LG. An unsolved question posed by our results is the dynamical origin of the MAH of the LGs. The isolation criteria commonly used to define LG-like haloes in unconstrained simulations do not narrow down the halo population into a set with quiet MAHs, nor does a further constraint to reside in a low-density environment.
The quiet MAH of the LGs provides a favourable environment for the formation of disc galaxies like the Milky Way and M31. The timing for the beginning of the last major merger in the Milky Way dark matter halo matches with the gas-rich merger origin for the thick component in the galactic disc. Our results support the view that the specific large- and mid-scale environments around the LG play a critical role in shaping its MAH and hence its baryonic structure at present.
Abstract Copyright: 2011 The Authors. Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): Galaxy: formation - galaxies: haloes - Local Group - cosmology: theory
Simbad objects: 4
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