Deep Hubble Space Telescope/ACS observations of I Zw 18: A Young galaxy in formation

Aug, 2004
29 pages
Published in:
  • Astrophys.J. 616 (2004) 768-782
e-Print:

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Abstract: (arXiv)
We present V and I photometry of the resolved stars in the most metal-deficient blue compact dwarf galaxy known, I Zw 18 (Zsun/50), using Hubble Space Telescope/Advanced Camera for Surveys (ACS) images, the deepest ones ever obtained for this galaxy. The resulting I vs. V-I color-magnitude diagram (CMD) reaches limiting magnitudes V=I=29 mag. It reveals a young stellar population of blue main-sequence (MS) stars (age <30 Myr) and blue and red supergiants (10 Myr
  • galaxies: dwarf
  • galaxies: individual (I Zw 18)
  • galaxies: ISM
  • galaxies: photometry
  • galaxies: starburst
  • galaxies: stellar content
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