S21A0114
S21A0114
We propose direct Lyα imaging of the cosmic web toward the z=3.09 SSA22 protocluster with HSC. This program will map out the spatial distribution of both ionized HII gas (via Lyα emission) and neutral HI gas (via Lyα absorption) simultaneously in and around the protocluster in a cosmological volume of 180 × 180 × 50 comoving Mpc by using the same, deepest NB497 image. We will unveil (1) the physical properties of the gas filaments, (2) the connection between the cosmic web and galaxies/AGNs, and (3) the role of the cosmic web on cluster formation. To identify HII gas filaments down to Lyα surface brightness of SBLyα = 3 × 10−19 ergs s−1 cm−2 arcsec−2 with a 3-σ level at a 3-arcsec resolution, we request 63 hours integration for NB497, in addition to 6 hours for g-band, and 9 hours for r-band images for precise continuum correction. To trace HI gas overdesity with a 5 cMpc resolution, we request 3 hours integration for NB527 to select ∼400 LBGs at z=3.3 with Lyα emission as background light sources. This special combination of emission and absorption line studies will enable us to constrain the total mass of main gas reservoir and radiative feedback process during the peak epoch of galaxy, super massive black hole, and cluster formation.
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