A Deep Large Binocular Telescope View of the Canes Venatici I Dwarf Galaxy

A Deep Large Binocular Telescope View of the Canes Venatici I Dwarf Galaxy
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深部大型双筒望远镜观察 Canes Venatici I 矮星系

DOI:
10.1086/525559
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发表时间:
2008
期刊:
The Astrophysical Journal Letters
影响因子:
--
通讯作者:
J. T. A
J. T. A
中科院分区:
--
文献类型:
--
作者:
Martin;Coleman;De Jong;J. T. A

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我们用大型双筒望远镜上的广视场大型双筒望远镜观测得到了第一张Cvn I矮星系的深色等图。向下延伸到最古老恒星的主序转换,它揭示了CVN I恒星种群的二分法:它包含一个古老的(≳10 Gyr),金属贫乏([\mathm{Fe}\,/\mathm{H}\,]\SIM-2.0)和空间扩展的种群,以及一个更年轻的(∼1.4-2.0Gyr),0.5度更富金属,空间上更集中的种群。这些年轻恒星也被位于银河系中心以东的^^_(+40)_(-20)PC所抵消。数据表明,这一年轻群体占该星系半光半径内恒星质量的3%-5%,应该与最近一次光谱调查中发现的运动学上较冷的恒星成分相一致。因此,CVN I遵循了其他遥远的MW矮星球体的行为,这些球体都包含中年和/或年轻群体:在极低质量的星系中,可能存在复杂的恒星形成历史。
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 ([\mathrm {Fe}\,/\mathrm {H}\,]\sim-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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