DeepHubble Space TelescopeACS Observations of I Zw 18: a Young Galaxy in Formation | Zendy

Y. I. Izotov | Zendy; T. X. Thuan | Zendy

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DeepHubble Space TelescopeACS Observations of I Zw 18: a Young Galaxy in Formation

Author(s) -

Y. I. Izotov,

T. X. Thuan

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/424990

Subject(s) - physics , astrophysics , astronomy , red giant branch , stars , advanced camera for surveys , asymptotic giant branch , galaxy , dwarf galaxy , star formation , population , myr , red supergiant , globular cluster , supergiant , chemistry , biochemistry , demography , genome , sociology , gene

We present V and I photometry of the resolved stars in the mostmetal-deficient blue compact dwarf galaxy known, I Zw 18 (Zsun/50), usingHubble Space Telescope/Advanced Camera for Surveys (ACS) images, the deepestones ever obtained for this galaxy. The resulting I vs. V-I color-magnitudediagram (CMD) reaches limiting magnitudes V=I=29 mag. It reveals a youngstellar population of blue main-sequence (MS) stars (age <30 Myr) and blue andred supergiants (10 Myr

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