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26 April 2024

» arxiv » 1310.0824

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The Formation History of the Ultra-Faint Dwarf Galaxies
Thomas M. Brown ; Jason Tumlinson ; Marla Geha ; Evan Kirby ; Don A. VandenBerg ; Jason S. Kalirai ; Joshua D. Simon ; Roberto J. Avila ; Ricardo R. Munoz ; Puragra Guhathakurta ; Alvio Renzini ; Henry C. Ferguson ; Luis C. Vargas ; Mario Gennaro ;
Date:	2 Oct 2013
Abstract:	We present early results from a Hubble Space Telescope survey of the ultra-faint dwarf galaxies. These Milky Way satellites were discovered in the Sloan Digital Sky Survey, and appear to be an extension of the classical dwarf spheroidals to low luminosities, offering a new front in the efforts to understand the missing satellite problem. Because they are the least luminous, most dark matter dominated, and least chemically evolved galaxies known, the ultra-faint dwarfs are the best candidate fossils from the early universe. The primary goal of the survey is to measure the star-formation histories of these galaxies and discern any synchronization due to the reionization of the universe. We find that the six galaxies of our survey have very similar star-formation histories, and that each is dominated by stars older than 12 Gyr.
Source:	arXiv, 1310.0824
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