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27 April 2024

» arxiv » 0709.3365

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A deep Large Binocular Telescope view of the Canes Venatici I dwarf galaxy
Nicolas F. Martin ; Matthew G. Coleman ; Jelte T. A. De Jong ; Hans-Walter Rix ; Eric F. Bell ; David J. Sand ; John M. Hill ; Christopher S. Kochanek ; David Thompson ; Vadim Burwitz ; Emanuele Giallongo ; Roberto Ragazzoni ; Emiliano Diolaiti ; Federico Gasparo ; Andrea Grazian ; Fernando Pedichini ; Jill Bechtold ;
Date:	21 Sep 2007
Abstract:	We present the first deep color-magnitude diagram of the Canes Venatici I (CVnI) dwarf galaxy from observations with the wide field Large Binocular Camera of the Large Binocular Telescope. Reaching down to the main-sequence turnoff of the oldest stars, it reveals a dichotomy in the stellar populations of CVnI: it harbors an old (>~ 10 Gyr), metal-poor ([Fe/H] ~ -2.0) and spatially extended population along with a much younger (~1.4-2.0 Gyr), 0.5 dex more metal-rich, and spatially more concentrated population. These young stars are also offset by ~100 pc to the East of the center of the galaxy. The data suggest that this young population should be identified with the kinematically cold stellar component found by Ibata et al. (2006). CVnI therefore follows the behavior of the other remote MW dwarf spheroidals which all contain intermediate age and/or young populations: a complex star formation history is possible in extremely low-mass galaxies.
Source:	arXiv, 0709.3365
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