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
(Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
April 28, Tuesday, 11:00 am in 104
" Mahalo Subaru, Ohako SWIMS, and Aloha TMT! "
We have been targeting ~10 proto-clusters and the general fields
covering the peak epoch of galaxy formation (1.4 < z < 3.7) through our
Mahalo-Subaru project. It employs unique sets of narrow-band filters
on wide field instruments (Suprime-Cam and MOIRCS) to map out
line-emitting star-forming galaxies (H-alpha, [OIII], and [OII] emitters)
associated to the proto-clusters or in narrow redshift slices in the
general field. We present that all of our targets show prominent
large-scale structures in and around them, indicating that they are
still in vigorous assembly phase. Moreover, we show that star formation
activity in the cluster cores is very high at z~2 involving a significant
fraction of dusty star-bursting galaxies.
The integrated star formation rate in the cluster core normalised by
the dynamical mass drops sharply as time progresses as (1+z)^6,
and the peak of star formation activity is shifted outwards to
surrounding lower density regions, indicating the ``inside-out''
growth of galaxy clusters.
Spectroscopic follow-up observations reveal that the proto-cluster
galaxies at z~2 tend to have much higher ionization states than
present-day counterparts, characterized by the presence of strong
[OIII] emission lines. Moreover, we find that their gaseous
metallicities in dense environment are systematically higher than
those in the general fields at z~2. This is probably due to some
environmental effects on the gaseous inflow/outflow processes.
I will then introduce our up-coming larger project SWIMS-18
which will start in early 2016 to expand and enhance the current
successful Mahalo-Subaru project. I will finally touch on our future
prospects on galaxy anatomy with TMT.
Seminars are also held at JAC,