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• W1965084008 endingPage "142" @default.
• W1965084008 startingPage "142" @default.
• W1965084008 abstract "We use a particle tagging technique to dynamically populate the N-body Via Lactea II high-resolution simulation with stars. The method is calibrated using the observed luminosity function of Milky Way (MW) satellites and the concentration of their stellar populations, and self-consistently follows the accretion and disruption of progenitor dwarfs and the buildup of the stellar halo in a cosmological live host. Simple prescriptions for assigning stellar populations to collisionless particles are able to reproduce many properties of the observed MW halo and its surviving dwarf satellites, like velocity dispersions, sizes, brightness profiles, metallicities, and spatial distribution. Our model predicts the existence of approximately 1850 subhalos harboring extremely faint satellites (with mass-to-light ratios >5 × 103) lying beyond the Sloan Digital Sky Survey detection threshold. Of these, about 20 are first galaxies, i.e., satellites that formed a stellar mass above 10 M☉ before redshift 9. The 10 most luminous satellites (L > 106 L☉) in the simulation are hosted by subhalos with peak circular velocities today in the range Vmax = 10–40 km s−1 that have shed between 80% and 99% of their dark mass after being accreted at redshifts 1.7 < z < 4.6. The satellite maximum circular velocity Vmax and stellar line-of-sight velocity dispersion σlos today follow the relation Vmax = 2.2σlos. We apply a standard mass estimation algorithm based on Jeans modeling of the line-of-sight velocity dispersion profiles to the simulated dwarf spheroidals and test the accuracy of this technique. The inner (within 300 pc) mass–luminosity relation for currently detectable satellites is nearly flat in our model, in qualitative agreement with the common mass scale found in MW dwarfs. We do, however, predict a weak, but significant positive correlation for these objects: M300∝L0.088 ± 0.024." @default.
• W1965084008 created "2016-06-24" @default.
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• W1965084008 date "2012-01-11" @default.
• W1965084008 modified "2023-09-26" @default.
• W1965084008 title "ON THE ASSEMBLY OF THE MILKY WAY DWARF SATELLITES AND THEIR COMMON MASS SCALE" @default.
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• W1965084008 doi "https://doi.org/10.1088/0004-637x/745/2/142" @default.
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