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The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru seminar organizers
(Tomonori Usuda, Kumiko S. Usuda, Naoyuki Tamura)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
September 30, Tuesday at 11:00 am
" The ACS LCID project: accurate measurements of the full star formation history in low metallicity, isolated, Local Group dwarf galaxies "
Matteo Monelli (Instituto de Astrofisica de Canarias)
The star formation history of Local Group galaxies is a powerful tool for
studying their evolution, including chemical enrichment histories and
stellar population gradients, which in turn may shed light on the role of
reionization or Supernovae feedback in dwarf galaxy formation and
evolution. In particular, isolated dwarfs are ideal laboratories since
their evolution has not been complicated by the vicinity of giant
galaxies. We will discuss the main results of the project Local
Cosmology from Isolated Dwarfs (LCID), aimed at deriving detailed star
formation histories for a sample of six Local Group isolated dwarf, low
metallicity, galaxies: two dIrr (IC1613 and Leo A), two transition
dIrr/dSph (LGS3 and Phoenix) and the only two isolated dSph in the Local
Group (Cetus and Tucana). To accomplish this goal we have collected, using
the ACS on board the HST, color-magnitude diagrams reaching their oldest
main sequence turnoff (V~28) with good
photometric accuracy. Accurate star formation histories have been derived
through comparison with synthetic color-magnitude diagrams, using the
IAC-pop algorithm. All galaxies
in our sample, except Leo A, show a substantial amount of old stellar
population, even though the subsequent evolution is varied. We will
discuss the implications of these star formation histories on current
scenarios of dwarf galaxy formation and evolution.