The inner halo of M 87: a first direct view of the red-giant population

@article{Bird2010TheIH,
  title={The inner halo of M 87: a first direct view of the red-giant population},
  author={Sarah A. Bird and William E. Harris and John P. Blakeslee and Chris Flynn},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={524}
}
An unusually deep (V, I) imaging dataset for the Virgo supergiant M 87 with the Hubble Space Telescope ACS successfully resolves its brightest red-giant stars, reaching M I (lim) = ―2.5. After assessing the photometric completeness and biasses, we use this material to estimate the metallicity distribution for the inner halo of M 87, finding that the distribution is very broad and likely to peak near [m/H] ≃ -0.4 and perhaps higher. The shape of the MDF strongly resembles that of the inner halo… 

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