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Title:
A Deep Large Binocular Telescope View of the Canes Venatici I Dwarf Galaxy
Authors:
Martin, Nicolas F.; Coleman, Matthew G.; De Jong, Jelte T. A.; Rix, Hans-Walter; Bell, Eric F.; Sand, David J.; Hill, John M.; Thompson, David; Burwitz, Vadim; Giallongo, Emanuele; Ragazzoni, Roberto; Diolaiti, Emiliano; Gasparo, Federico; Grazian, Andrea; Pedichini, Fernando; Bechtold, Jill
Affiliation:
AA(Max-Planck-Institut für Astronomie, Heidelberg, Germany; .), AB(Max-Planck-Institut für Astronomie, Heidelberg, Germany; .), AC(Max-Planck-Institut für Astronomie, Heidelberg, Germany; .), AD(Max-Planck-Institut für Astronomie, Heidelberg, Germany; .), AE(Max-Planck-Institut für Astronomie, Heidelberg, Germany; .), AF(Steward Observatory, University of Arizona, Tucson, AZ.; Chandra Fellow.), AG(Large Binocular Telescope Observatory, University of Arizona, Tucson, AZ.), AH(Large Binocular Telescope Observatory, University of Arizona, Tucson, AZ.), AI(Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany.), AJ(INAF, Osservatorio Astronomico di Roma, Monteporzio, Italy.), AK(INAF, Osservatorio Astronomico di Padova, Padova, Italy.), AL(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy.), AM(INAF, Osservatorio Astronomico di Trieste, Trieste, Italy.), AN(INAF, Osservatorio Astronomico di Roma, Monteporzio, Italy.), AO(INAF, Osservatorio Astronomico di Roma, Monteporzio, Italy.), AP(Steward Observatory, University of Arizona, Tucson, AZ.)
Publication:
The Astrophysical Journal, Volume 672, Issue 1, pp. L13-L16. (ApJL Homepage)
Publication Date:
01/2008
Origin:
UCP
ApJ Keywords:
galaxies: individual (Canes Venatici I), Galaxies: Stellar Content, Galaxies: Local Group
DOI:
10.1086/525559
Bibliographic Code:
2008ApJ...672L..13M

Abstract

We present the first deep color-magnitude diagram of the Canes Venatici I (CVn I) 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 CVn I: 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+40-20 pc to the east of the galaxy center. The data suggest that this young population, which represents ~3%-5% of the stellar mass of the galaxy within its half-light radius, should be identified with the kinematically cold stellar component found in a recent spectroscopic survey. CVn I 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.

Based on data acquired using the Large Binocular Telescope (LBT). The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are the University of Arizona on behalf of the Arizona university system; Istituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; Ohio State University, and the Research Corporation, on behalf of the University of Notre Dame, the University of Minnesota, and the University of Virginia.

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