A New Deep HST/ACS CMD of I Zw 18: Evidence for Red Giant Branch Stars

@article{Aloisi2006AND,
  title={A New Deep HST/ACS CMD of I Zw 18: Evidence for Red Giant Branch Stars},
  author={A. Aloisi and F. Annibali and J. Mack and M. Tosi and R. Marel and G. Clementini and R. Contreras and G. Fiorentino and M. Marconi and I. Musella and A. Saha},
  journal={arXiv: Astrophysics},
  year={2006},
  volume={2}
}
  • A. Aloisi, F. Annibali, +8 authors A. Saha
  • Published 2006
  • Physics
  • arXiv: Astrophysics
  • We present results from new deep HST/ACS photometry of I Zw 18, the most metal-poor blue compact dwarf galaxy in the nearby universe. It has been previously argued that this is a very young system that started forming stars only 1 Gyr) red giant branch (RGB) stars may exist in this galaxy. Our deeper data indeed reveal evidence for an RGB. Underlying old (> 1 Gyr) populations are therefore present in even the most metal-poor systems, implying that star formation started at z > 0.1. The RGB tip… CONTINUE READING

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    References

    Publications referenced by this paper.
    Proc. IAU Symp. 235
    • 2006