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25 April 2024

» arxiv » 1410.0681

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The Quenching of the Ultra-Faint Dwarf Galaxies in the Reionization Era
Thomas M. Brown ; Jason Tumlinson ; Marla Geha ; Joshua D. Simon ; Luis C. Vargas ; Don A. VandenBerg ; Evan N. Kirby ; Jason S. Kalirai ; Roberto J. Avila ; Mario Gennaro ; Henry C. Ferguson ; Ricardo R. Munoz ; Puragra Guhathakurta ; Alvio Renzini ;
Date:	2 Oct 2014
Abstract:	We present new constraints on the star formation histories of six ultra-faint dwarf galaxies: Bootes I, Canes Venatici II, Coma Berenices, Hercules, Leo IV, and Ursa Major I. Our analysis employs a combination of high-precision photometry obtained with the Advanced Camera for Surveys on the Hubble Space Telescope, medium-resolution spectroscopy obtained with the DEep Imaging Multi-Object Spectrograph on the W.M. Keck Observatory, and updated Victoria-Regina isochrones tailored to the abundance patterns appropriate for these galaxies. The data for five of these Milky Way satellites are best fit by a star formation history where at least 75% of the stars formed by z~10 (13.3 Gyr ago). All of the galaxies are consistent with 80% of the stars forming by z~6 (12.8 Gyr ago) and 100% of the stars forming by z~3 (11.6 Gyr ago). The similarly ancient populations of these galaxies support the hypothesis that star formation in the smallest dark matter sub-halos was suppressed by a global outside influence, such as the reionization of the universe.
Source:	arXiv, 1410.0681
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