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

doi:10.1086/525559

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

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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.

Original language	English (US)
Pages (from-to)	L13-L16
Journal	Astrophysical Journal
Volume	672
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/525559
State	Published - 2008

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/525559

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Martin, N. F., Coleman, M. G., De Jong, J. T. A., Rix, H. W., Bell, E. F., Sand, D. J., Hill, J. M., 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, 672(1 PART 2), L13-L16. https://doi.org/10.1086/525559

@article{61a7e6622153495fb2959b6d58c0a072,

title = "A deep large binocular telescope view of the Canes Venatici I dwarf galaxy",

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.",

keywords = "Galaxies: individual (Canes Venatici I), Galaxies: stellar content, Local Group",

author = "Martin, {Nicolas F.} and Coleman, {Matthew G.} and {De Jong}, {Jelte T.A.} and Rix, {Hans Walter} and Bell, {Eric F.} and Sand, {David J.} and Hill, {John M.} and David Thompson and Vadim Burwitz and Emanuele Giallongo and Roberto Ragazzoni and Emiliano Diolaiti and Federico Gasparo and Andrea Grazian and Fernando Pedichini and Jill Bechtold",

note = "Funding Information: The authors gratefully thank the LBT Science Demonstration Time team for making these observations possible. 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.",

year = "2008",

doi = "10.1086/525559",

language = "English (US)",

volume = "672",

pages = "L13--L16",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1 PART 2",

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TY - JOUR

T1 - A deep large binocular telescope view of the Canes Venatici I dwarf galaxy

AU - Martin, Nicolas F.

AU - Coleman, Matthew G.

AU - De Jong, Jelte T.A.

AU - Rix, Hans Walter

AU - Bell, Eric F.

AU - Sand, David J.

AU - Hill, John M.

AU - Thompson, David

AU - Burwitz, Vadim

AU - Giallongo, Emanuele

AU - Ragazzoni, Roberto

AU - Diolaiti, Emiliano

AU - Gasparo, Federico

AU - Grazian, Andrea

AU - Pedichini, Fernando

AU - Bechtold, Jill

N1 - Funding Information: The authors gratefully thank the LBT Science Demonstration Time team for making these observations possible. 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.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Galaxies: individual (Canes Venatici I)

KW - Galaxies: stellar content

KW - Local Group

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U2 - 10.1086/525559

DO - 10.1086/525559

M3 - Article

AN - SCOPUS:46249120910

SN - 0004-637X

VL - 672

SP - L13-L16

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 2

ER -

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

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Keywords

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