Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation

Details Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation Deep Hubble Space Telescope/ACS Observations of I Zw 18: a Young Galaxy in Formation

2004-08-21

arxiv.org/abs/astro-ph/0408391v1

Astrophys.J. 616 (2004) 768-782

Astronomy and Astrophysics

Astrophysics

29 pages, 13 Postscript figures, accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/424990

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

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