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

Research output: Contribution to journalArticle

34 Citations (Scopus)

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.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume672
Issue number1 PART 2
DOIs
StatePublished - 2008

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young population
dwarf galaxies
telescopes
metal
galaxies
harbor
diagram
history
stars
dichotomies
harbors
color-magnitude diagram
stellar mass
metals
star formation
cameras
young
histories
radii
complex formation

Keywords

  • Galaxies: individual (Canes Venatici I)
  • Galaxies: stellar content
  • Local Group

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Martin, N. F., Coleman, M. G., De Jong, J. T. A., Rix, H. W., Bell, E. F., Sand, D. J., ... Bechtold, J. (2008). A deep large binocular telescope view of the Canes Venatici I dwarf galaxy. Astrophysical Journal, 672(1 PART 2). https://doi.org/10.1086/525559

A deep large binocular telescope view of the Canes Venatici I dwarf galaxy. / 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.

In: Astrophysical Journal, Vol. 672, No. 1 PART 2, 2008.

Research output: Contribution to journalArticle

Martin, NF, Coleman, MG, De Jong, JTA, Rix, HW, Bell, EF, Sand, DJ, Hill, JM, Thompson, D, Burwitz, V, Giallongo, E, Ragazzoni, R, Diolaiti, E, Gasparo, F, Grazian, A, Pedichini, F & Bechtold, J 2008, 'A deep large binocular telescope view of the Canes Venatici I dwarf galaxy', Astrophysical Journal, vol. 672, no. 1 PART 2. https://doi.org/10.1086/525559
Martin NF, Coleman MG, De Jong JTA, Rix HW, Bell EF, Sand DJ et al. A deep large binocular telescope view of the Canes Venatici I dwarf galaxy. Astrophysical Journal. 2008;672(1 PART 2). https://doi.org/10.1086/525559
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. / A deep large binocular telescope view of the Canes Venatici I dwarf galaxy. In: Astrophysical Journal. 2008 ; Vol. 672, No. 1 PART 2.
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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.",
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AU - Bell, Eric F.

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