Subaru Seminars



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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 (Tadayuki Kodama, Kumiko S. Usuda, Naoyuki Tamura, Tomonori Usuda) by email : (please change"_at" to @).

June 10, Thursday, at 11:00 am

" Panoramic Views of Cluster Evolution since z=3 with Subaru "

Tadayuki Kodama

(Subaru Telescope)

We will present overviews of the two cluster projects that we have been conducting on Subaru, namely PISCES for 0.4<z<1.6 and HzRG for 1.5<z<5. From these projects, a consistent picture has been emerging that the star forming activity is once enhanced and then truncated in galaxy groups in the outskirts of clusters during the course of cluster assembly at z<1. However, such activity is shifted into cluster cores as we go further back in time to z~1.5. At z=2-2.5, we begin to enter the epoch where massive galaxies are actually forming in the cluster core. And by z~3, we eventually go beyond the major epoch of massive galaxy formation.
It is likely that the environmental dependence of star forming activity is at least partly due to the external environmental effect such as galaxy-galaxy interaction in medium density regions at z<1, while the intrinsic effect of galaxy formation bias overtakes the external effect at higher redshifts, resulting in a large star formation activity in the cluster centre. Together with the mass dependence of galaxy properties, which is also clearly reproduced in our data, we will sketch the propagation of galaxy formation and truncation from massive galaxies in high density regions to less massive galaxies in low density regions.

Seminars are also held at JAC, CFHT, and IfA.

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