S21B0079

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 the intergalactic medium (IGM) and circumgalactic medium (CGM) to test this fundamental prediction is a major goal of observational astronomy. Recent discovery of Mpc-scale Ly α filaments at the z=3.1 SSA22 proto-cluster core highlights the importance of proto-clusters in this context, where accelerated gas accretion driven by a deep potential well is expected. Here we propose a KCWI observation toward the HS1700 proto-cluster at z=2.3 to expand our knowledge of the cosmic web to z∼2. Tracing extended Ly α emission, we will map a plausible node of the cosmic web that harbors a massive molecular gas reservoir and a rest-frame UV selected galaxy at z=2.3. Our goals are (i) to uncover diffuse hydrogen reservoirs around the two galaxies, (ii) to verify the cosmic web on a >10 comoving Mpc scale, in conjunction with a previous narrow-band image, (iii) to unveil baryon cycling around the massive, growing galaxies. As a valuable filler target, we will also observe an extremely bright submillimeter galaxy simultaneously, and dispose the surrounding environment.

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