(Proposal ID) S16A-023

(PI) Okoshi, Katsuya

(Proposal Title)
Survey for Galaxies associated with coincident, multiple HI gas at high-z II

(Abstract)
We propose to carry out a systematic search for reliable detections of star 
formation activity associated with coincident, multiple HI gas in spectra of 
gravitationally lensed quasars at high redshift. By measuring the spatial 
distributions of HI gas and associated metals with respect to the host 
galaxies, we aim to establish a picture for understanding how the 
circumgalactic media affect the formation and/or evolution of primordial 
galaxies. We are going to use the Subaru/Kyoto-3DII and Keck/OSIRIS IFU 
spectroscopy mode whose sensitive wavelengths correspond to the redshifted 
[OII] and Halpha emission lines of host galaxies at z=1-3, respectively. 
The high resolution imaging with LGSAO enables us to approach the galaxies 
hosting HI gas at small impact parameter (<1 arcsec) without hampering the 
glare of background quasars. The combination of high-performance LGSAO, 
IFU spectroscopy, and multiple sight lines is the most promising way to 
search for faint emissions associated with multiple HI gas from small to 
large impact parameters in the circumgalactic medium. {This is a resubmission 
of the previously accepted programs (S14A-032, S13A-078) which were all wiped 
out due to bad weather and instrument trouble.}