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, David Thompson,, Vadim Burwitz, Emanuele Giallongo, Roberto Ragazzoni, Emiliano Diolaiti,, Federico Gasparo, Andrea Grazian, Fernando Pedichini, Jill Bechtold

TL;DR
This study provides the first deep color-magnitude diagram of the Canes Venatici I dwarf galaxy, revealing a complex stellar population with both old and young stars, indicating a varied star formation history.
Contribution
It presents the first detailed analysis of CVnI's stellar populations using deep imaging, uncovering a spatial and age-based dichotomy in its stars.
Findings
Discovery of an old, metal-poor, extended population.
Identification of a younger, more metal-rich, concentrated population.
Young stars are offset by approximately 64 pc east of the galaxy center.
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 on 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 64_{-20}^{+40} pc to the East of the galaxy center. The data suggest that this young population, which represent ~ 3-5 % of the stellar mass of the galaxy within its half-light radius, 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…
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