Abstact: JWST is revolutionizing the extra-galactic surveys towards the highest redshifts due to its longer wavelength coverage and spectacular sensitivity. However, given its limited field of view (~10 arcmin^2), searching for gigantic and/or rare objects on the sky, such as proto-clusters and their surrounding large scale structures and super massive galaxies is yet inefficient.
ULTIMATE-Subaru is a nice complement because it offers a 0.2 resolution in the K-band across a 14'x14' field of view with the combination of ground-layer adaptive optics system (GLAO) and the new wide-field imager (WFI). This next generation system on Subaru has been funded (for a significant part) and is under development to be completed by 2029.
WFI will be equipped with a unique suit of many narrow and medium-band filters in the near-infrared regime, unlike Euclid or Roman, which can thus capture a series of emission lines from star forming galaxies or AGNs, and the Balmer break feature of quiescent galaxies back to z=5.4. Moreover, the imaging data alone can efficiently and effectively characterize the properties of galaxies, such as redshifts, stellar populations, HI gas distributions, and SF/AGN activities.
We have been conducting similar surveys with the existing instruments over more than the past 10 years, and obtaining intriguing results, including star-bursting proto-clusters with filamentary cold gas distribution and enhanced AGN activities at z~2, and ultra massive galaxy candidates associated to overdense regions at z~5.
In this talk, I will highlight some of our new science results and then describe our future prospects with ULTIMATE-Subaru.
Short bio: Tadayuki Kodama is a professor at the Astronomical Institute, Tohoku University, where he also heads the Division for International Research and Educational Cooperation (DiRECT). He received his Bachelor of Science from Kyoto University in 1992 and his Doctor of Science from the University of Tokyo in 1997. He subsequently held research positions at the University of Cambridge (1997–1999) and Durham University (1999–2000) as a JSPS fellow, followed by a research associate post at the University of Tokyo (2000–2001). He then joined the National Astronomical Observatory of Japan, serving as assistant professor from 2001 to 2004 and associate professor from 2005 to 2017, before taking up his current professorship at Tohoku University in 2017. His research focuses on the formation and evolution of galaxies and galaxy clusters, the large-scale structure of the Universe, and stellar populations and chemical evolution.