Computer Science
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1294..252b&link_type=abstract
THE FIRST STARS AND GALAXIES: CHALLENGES FOR THE NEXT DECADE. AIP Conference Proceedings, Volume 1294, pp. 252-254 (2010).
Computer Science
Dwarf Stars, Dark Matter, Galaxy, Clusters Of Galaxies, Dwarf Galaxies, Dark Matter, Origin, Formation, Evolution, Age, And Star Formation, Elliptical Galaxies
Scientific paper
We present the results from a new set of CDM simulations suggesting that a fraction of the recently discovered ultra-faint dwarf population consists of the fossil remnants of galaxies that formed the majority of their stars before reionization. Our new simulations allow us to map the distribution of fossil and non-fossils dwarfs in the Local group and compare the simulated maps to observations. We show good agreement between our simulations and observations of the ultra-faints in both their radial distribution within the Milky Way virial radius and their stellar properties. However, the properties of the faintest ultra-faint satellites found within 50 kpc of the Galactic center do not agree with being well-preserved fossils of the first galaxies, perhaps because they are modified by tidal effects. We also find some discrepancies with respect to the number of dwarfs in the regions outside the Milky Way virial radius.
Bovill Mia S.
Ricotti Massimo
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