Substructure in the stellar halos of the Aquarius simulations

Details Substructure in the stellar halos of the Aquarius simulations Substructure in the stellar halos of the Aquarius simulations

2011-01-13

arxiv.org/abs/1101.2544v2

ApJ, 2011, 733, L7

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

5 pages, 5 color figures, accepted on April 8, 2011 with a change in title. A high-resolution version of the paper may be foun

Scientific paper

We characterize substructure in the simulated stellar halos of Cooper et al. (2010) which were formed by the disruption of satellite galaxies within the cosmological N-body simulations of galactic halos of the Aquarius Project. These stellar halos exhibit a wealth of tidal features: broad overdensities and very narrow faint streams akin to those observed around the Milky Way. The substructures are distributed anisotropically on the sky, a characteristic that should become apparent in the next generation of photometric surveys. The normalized RMS of the density of stars on the sky appears to be systematically larger for our halos compared to the value estimated for the Milky Way from main sequence turn-off stars in the Sloan Digital Sky Survey. We show that this is likely to be due in part to contamination by faint QSOs and redder main sequence stars, and might suggest that ~10% of the Milky Way halo stars have formed in-situ.

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