(Proposal ID) S16A-085

(PI) Yamada, Toru

(Proposal Title)
Huge volume tomographic survey in the SSA22 proto-cluster with Keck/DEIMOS

(Abstract)
We conduct wide-field spectroscopy with Keck/DEIMOS toward the SSA22 field in 
order to reveal (i) the correlation between galaxies and H{i} in the 
intergalactic medium (IGM) in three-dimensional space quantitatively and 
(ii) the circumgalactic medium (CGM) of Lyman break galaxies (LBGs), Lyalpha 
emitters (LAEs), and Lyalpha blobs (LABs) in various galaxy environments, by 
using about 800 spectra of LBGs at 2.5 < z < 5.5. Regarding (i), we will map 
the H{i} 3D distribution in the known proto-cluster at z=3.1 in the field by 
using spectra of background galaxies. Regarding (ii), we will analyze the same 
spectra as a function of the projected distance from galaxies, in particular 
LAEs and LABs, and visualize the radial dependence of H{i} and some metal 
absorptions in the CGM of these proto-cluster galaxies. We also make the same 
analysis for galaxy overdensities and voids found at other redshift along the 
sight-line, revealing the IGM H{i}--galaxy correlation in these structures and 
the CGM of various galaxies in various environments at 2.5 < z < 5. This 
project is a two-year collaboration with a team in the University of 
California. While 5 nights were awarded in 15B (2 Subaru, 3 UC), the first 
2 nights (Subaru) were lost due to the bad weather. We here propose to recover 
them in S16A.