(Proposal ID) S17B-136

(PI) Umehata, Hideki

(Proposal Title)
Unveiling Galaxy Assembly along the IGM Filaments at a proto-cluster core

(Abstract)
The current framework of the cold dark matter universe predicts that matter 
assembles in filaments, and  at the intersection of which galaxies form and 
evolve. Directly imaging this intergalactic medium (IGM) to test this 
fundamental prediction is a major goal of observational astronomy. Recently 
we have found a convincing candidate of such "cosmic web" in the surroundings 
of a z~3.09 proto-cluster core. Combining Subaru narrow-band Ly alpha image 
with ALMA and Chandra data, we discovered very extended Ly alpha filaments 
"illuminated" by numerous starbursts and AGNs. This suggests that we are 
seeing rapid growth of galaxies and SMBHs, fueled by cold intergalactic gas 
along the filaments. The Ly alpha filament will be mapped in 3D using VLT/MUSE.
Here we propose MOSFIRE K-band spectroscopy of the ALMA-Chandra-MUSE deep 
field in SSA22. The observation will enable us to trace the structure and 
kinematics of the "cosmic web" combined with MUSE data. We will also uncover 
the interaction between galaxies and cosmic web, detecting energetic outflows.