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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 (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

April 28, Tuesday, 11:00 am in 104

" Mahalo Subaru, Ohako SWIMS, and Aloha TMT! "

Tadayuki Kodama


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, CFHT, and IfA.

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