S21A0045

We propose Keck/KCWI observations for a field around an association of a damped Lyα absorption system (DLA), two Lyman break galaxies (LBGs), and a gas-rich submm galaxy (SMG) at z=3.3 in order to examine Lyα filaments in and around the galaxy overdensity. The configuration of the four objects implies that the DLA is a dense part embedded in a cosmic web filament. An enhanced ionizing radiation field in the overdensity environment illuminates the H i gas in the cosmic web as well as the DLA and will produce the fluorescent Lyα emission from the gas. Successful imaging of the Lyα filaments will present the first identification of the DLA location in the large-scale structure, which will be new information to discuss the origin of DLAs and their roles in the galaxy formation and evolution. We may even succeed in measuring the DLA size, for the first time. The SMG location in the cosmic web will also be examined, leading a discussion of the triggering mechanism of its intense starburst. The obtained data cube is also useful to perform a very deep survey of Lyα emitters in and around the particular galaxy environment, enabling us to find a very faint LAE with a star formation rate of ∼0.1 M_⊙ yr⁻¹ hosting the DLA, if it exists.

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