Science Keywords: Select from 2 to 5 items. Science Keywords is a required field. US Admin CoI is a required field. 0 Assigned ID: 2635 ----- Attempting Submission 1 (Thu Nov 11 15:07:40 GMT 2021) ----- Joint NRAO/HST 0 ----- Attempting Submission 1 (Tue Dec 14 13:12:36 GMT 2021) ----- HST Phase II Proposal 16891 successfully submitted. Receipt: # 16891-1 ----- Attempting Submission 2 (Tue Dec 14 13:13:40 GMT 2021) ----- HST Phase II Proposal 16891 successfully submitted. Receipt: # 16891-2 ----- Attempting Submission 3 (Tue Dec 14 13:15:02 GMT 2021) ----- ----- Attempting Submission 4 (Mon Feb 28 05:03:54 GMT 2022) ----- 0 Massive galaxies at high-z are known to co-evolve with their circumgalactic medium (CGM), generally detected in Ly-alpha. The most extreme environments are Enormous Ly-alpha Nebulae (ELANe), found in the cores of proto- clusters. We propose to use the VLA to observe CO(1-0) in two spectacular ELANe from an ALMA survey at z~2. Q1416+2649 shows gas across 100 kpc with an extremely broad FWHM(~1000km/s), while Q2123-0050 shows companions with widely varying CO/CI line ratios and cold gas in the CGM. The CO(1-0) observations will give the most reliable estimates of the mass of the cold gas and trace the most extended molecular reservoirs. Together with the CO(4-3), [CI], and Lya, the crucial CO(1-0) data will allows us to probe the physical conditions of the multi- phase gas in the various regions of these nebulae. We will compare this to similar studies done on the enigmatic Spiderweb and MAMMOTH-I nebulae. This will start to give us a handle on the statistical properties of the various molecular tracers in ELANe, and allow us to study massive galaxies. Our project contains 1 orbit. In this project, we have 1 target: Q2123-0050 and we will use WFC3/F105W filter to detect and resolve the small galaxies that occupy these nebulae, reveal their morphological details, and identify any stellar light outside the main body of these galaxies. For cosmic ray rejection, we use 5 different exposures to populate this orbit. We checked the HST instrumentation handbook and we found that it suggests a 5 different exposures to populate a ~2600 sec exposure for a complete rejection of cosmic rays. Specifically, we use a wide 5-pionts pattern. We think these arrangements enables us to reject cosmic ray, and provide a half-pixel subsampling of the point-spread function (PSF) for each pointing. We use a 1 visits to populate this orbit. We first use NSAMP= 12, SPARS=50 for the four exposures, and then a NSAMP=6, SPARS=50 exposure for the another exposure. We use IR-FIX to center each pointing, enabling to perfectly center the pointing in the detector. Our galaxies are randomly distributed in this field. PI Jianrui Li is a graduate student who started a PhD thesis on this topic and are currently working on the ALMA data. Co-I Bjorn Emonts is an expert in studies of cold molecular gas at low-surface-brightness in cluster environments, and PI on the paper showcasing the HST/VLA comparison in the Mammoth Nebula, which can be regarded as a pilot for the current project. Co-I Zheng Cai is an expert on the CGM study through the emission, and he discovers most of the nebulae at z=2 and the MAMMOTH-1 nebula. He also has published a number of HST deep imaging papers. Co-I Jianan Li is a postdoctor who is currently working on the ALMA data. Galaxies 6 false false false false false false false false SUPPORTED GALAXY QSO J2000 J2000 WFC3/IR Imaging No No F105W 1646024555257 The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. /private/var/folders/kh/2q265qhs21z4gjkd_kq0xndc0000gn/T/OPVisit10756025996403932400.xml (Tic-Visit :proposal-id 16891 :visit-id "01" :proposal-version -1 :trans-version "20210514" :date "28-Feb-2022 13:02:34.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1027120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16891 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16891 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2755 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0