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arxiv: 1410.0681 · v1 · pith:WTWWWH6Snew · submitted 2014-10-02 · 🌌 astro-ph.GA · astro-ph.CO

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
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Roberto J. Avila Mario Gennaro Henry C. Ferguson Ricardo R. Munoz Puragra Guhathakurta Alvio Renzini
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classification 🌌 astro-ph.GA astro-ph.CO
keywords galaxiesformationstarstarsdwarfformingobtainedreionization
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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.

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