Oral Presentation
ULTIMATE survey of large scale structures and protoclusters at z>2
Presenter: Tadayuki Kodama (Tohoku University)
Present-day cluster are assembled from much wide areas of more than 20 cMpc across at the cosmic noon. To properly cover the majority of progenitors of present-day clusters, we need to survey an area of at least 10 arcmin on a side for each protocluster at NIR. At the large projected distance from the cluster center, it is also critical to remove fore-/background contamination as the fraction of member galaxies decreases rapidly.
These have been the major obstacles for the past and current observational studies of protoclusters.
We will be able to overcome these issue with the next major facility on Subaru Telescope called ULTIMATE.
ULTIMATE-Subaru is a combination of the wide-field ground-layer adaptive optics (GLAO; FWHM=0.2" in the K-band) and the wide-field imager (WFI; FoV=14'x14') at NIR, offering 7 times larger FoV than current MOIRCS and 20 times larger than JWST.
Moreover we will install many and wide variety of medium-band and narrow-band filters (10 MBFs and more than 10 NBFs), which will make ULTIMATE unique over the wide-field space telescopes such as Euclid and Roman.
MBFs are powerful to identify quiescent galaxies by Balmer/4000A break features while NBFs will efficiently trace emission line galaxies (star forming galaxies and AGNs) associated to the large scale structures in a respective redshift slice. We can thus investigate whole galaxy populations associated to protoclusters with little projection effects, even at their lower density outskirts.
In this presentation, we will first show some key results on protoclusters from our highly relevant past/on-going/near-future programs (MAHALO, HIMMEL, and SWIMS-18) and then propose core programs to be conducted with ULTIMATE which will largely extend our current knowledge regarding the connections between large scale structure formation and galaxy co-evolution therein.
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