Deep Hubble Space Telescope/ACS observations of I Zw 18: A Young galaxy in formation
Aug, 200429 pages
Published in:
- Astrophys.J. 616 (2004) 768-782
e-Print:
- astro-ph/0408391 [astro-ph]
DOI:
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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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