0 Assigned ID: 3198 ----- Attempting Submission 1 (Fri Mar 25 12:14:32 GMT 2022) ----- HST Phase I Proposal 3198 successfully submitted. Receipt: # 3198-1 Implementing Visit Z2 by setting it to one orbit with a newly defined dithering pattern. Prepared by Weichen Wang. 113980620 ----- Attempting Submission 1 (Thu Jul 14 20:35:45 GMT 2022) ----- ----- Attempting Submission 2 (Thu Apr 27 17:14:21 GMT 2023) ----- Resolving a Massive Node of the Cosmic Web at z=3 How do galaxies get their gas? What is the morphology and kinematics of the accreting gas and how does this affect galaxy evolution? A recent MUSE observation targeting a quasar at z=3 has finally provided the way to directly address these questions through one of the first images of contiguous Cosmic Web filaments on scales of several comoving Mpc. The filaments converge into a node associated with a large concentration of galaxies: two of these - separated only by 2" - have AGN-like spectra making them one of the few known close-binary AGN at high-z and the only triplet, including the quasar, which is 10" away. Because of the seeing-limited nature of the MUSE observations, the majority of the galaxies associated to the filaments and the AGN hosts are unresolved. To overcome this limitation we propose ACS imaging in two filters sampling the galaxy rest-frame UV continuum emission in order to: i) reveal the relation between the gaseous filaments properties (such as gas densities and kinematics) and the morphological properties (such as size, clumpiness and structural parameters) of the associated galaxy star forming regions in order to study how galaxies form their stars, ii) detect the diffuse UV light associated with galaxy interactions and intergalactic star formation in order to constrain the role of environment in the formation of the stellar and AGN components of the progenitor of today's massive galaxies. The proposed ACS imaging will be the perfect complement to the multi-wavelength, ongoing deep observations with JWST, ALMA and Chandra on this field providing a new window on the study of early galaxy and structure formation in a massive node of the Cosmic Web. In order to reach the scientific goals of the proposal, two broad-band filters are used (F625W and F814W) sampling the rest-frame UV emission of galaxies at the redshift of the MQN01 structure (z=3.2) found through a MUSE mosaic of 2'x2'. Current area of interest if fully covered by one ACS/WFC poiting irrespective of the orientation. For each filter, observations are split in visits of 2 orbits each in order to maximize schedulability. Each orbit contains two equal exposures of about 1200s each minimizing CTE losses. The large number of exposures (20 exposures for F625W and 24 exposures for F814W) and a dithering pattern will be used to reject both CR and hot pixels. The dithering pattern consists of 4 shifts of about 3" in the Y direction in order to cover the chip gap plus smaller shifts obtained changing the POS TARG field. The most interesting region is an area of radius ~10" centered on the quasar CTS G18.1 (main target). By placing the main target in the "WFC" aperture position, such area is always contained in a single chip and not affected by the chip gap irrespective of orientation. No constraints have been put between orientations used in the two filters although it would be of course beneficial if the same range of orientation is used for both filters to increase the sky area overlap. Our team has the necessary scientific and technical expertise to undertake all the aspects related to the investigations discussed in this proposal, including the data reduction, analysis and interpretation of the HST/ACS data as well as the comparison with deep MUSE data. PI Cantalupo is the PI of the deep MUSE data discussed in this proposal and has a strong expertise with both observational and theoretical aspects of intergalactic Ly-alpha emission at high redshift in connection with galaxy formation. Co-I and Admin-PI Steidel and Co-I Lilly are world-leading expert in the study of high redshift galaxies and the circumgalactic/intergalactic medium using both ground-based facilities and HST. Co-Is Fossati, Fumagalli, Galbiati, Gallego, Mackenzie, Matthee, Travascio, and Wang have strong expertise in the study of galaxy formation and the intergalactic medium at high redshift and, in particular, experience with Integral-field and spectroscopic observations and/or HST imaging. Co-Is de Beer, Lazeyras, and Pezzulli have expertise in theoretical and numerical modeling of galaxy and structure formation at high redshift. Co-I Maseda has strong expertise with HST data analysis and he was part of the 3D-HST team. Co-I Nanayakkara has expertise on galaxy evolution and photoionization models. Co-I Pensabene is an expert of high-redshift AGN and quasar formation. Galaxies Intergalactic Medium and the Circumgalactic Medium 6 false false false false false false false false SUPPORTED GALAXY EMISSION LINE NEBULA LYMAN ALPHA CLOUD QUASAR CTSG18.1 CTQ0408 J2000 J2000 ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F625W POS-TARG DITHER 3.034 LINE false false 4 85.29 ACS-WFC-DITHER-LINE 1 false POS-TARG DITHER 3.034 LINE false false 2 85.29 ACS-WFC-DITHER-LINE 2 false The scheduling data was generated by CASM 31.0. 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