Metallicity Distribution Function of the Eridanus II Ultra-faint Dwarf Galaxy from Hubble Space Telescope Narrowband Imaging

@article{Fu2022MetallicityDF,
  title={Metallicity Distribution Function of the Eridanus II Ultra-faint Dwarf Galaxy from Hubble Space Telescope Narrowband Imaging},
  author={Sal Wanying Fu and Daniel R. Weisz and Else Starkenburg and Nicolas F. Martin and Alexander P. Ji and Ekta Patel and Michael Boylan-Kolchin and Patrick C{\^o}t{\'e} and Andrew E. Dolphin and Nicolas Longeard and Mario L. Mateo and Nathan Ross Sandford},
  journal={The Astrophysical Journal},
  year={2022},
  volume={925}
}
We use deep narrowband CaHK (F395N) imaging taken with the Hubble Space Telescope (HST) to construct the metallicity distribution function (MDF) of Local Group ultra-faint dwarf galaxy Eridanus II (Eri II). When combined with archival F475W and F814W data, we measure metallicities for 60 resolved red giant branch stars as faint as m F475W ∼ 24 mag, a factor of ∼4× more stars than current spectroscopic MDF determinations. We find that Eri II has a mean metallicity of [Fe/H] = −2.50 −0.07+0.07… 

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