16891( 3) - 28-Feb-2022 22:22:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16891 Version: 3 Check-in Time: 28-Feb-2022 22:22:33 STScI Edit Number: 0 Title Galaxy Formation in the Extreme: Molecular Gas in Enormous Lya Nebulae at z~2 ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Jianrui Li Tsinghua University Y CoI: Dr. Bjorn Emonts Associated Universities, Inc. Y CoI: Dr. Zheng Cai Tsinghua University Y CoI: Dr. Jianan Li Peking University Y ------------------------------------------------------------------------------------ Abstract 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. ------------------------------------------------------------------------------------ Observations Description ------------------------ 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. ------------------------------------------------------------------------------------ 16891( 3) - 28-Feb-2022 22:22:33 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 Q2123-0050 GALAXY, QSO RA=21H23M29.4600S, J2000 V = 16.34 +/- 0.01 DEC=-00D50'52.90" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 16891( 3) - 28-Feb-2022 22:22:33 - [ 3] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 Q2123-0050 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF POS TARG 0.000, 0.000 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 Q2123-0050 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF POS TARG 0.704, 0.051 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 Q2123-0050 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS50, NSAMP=6 1 DEF POS TARG 1.409, 0.101 CUM (252.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 Q2123-0050 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF POS TARG 0.352, 0.630 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 Q2123-0050 WFC3/IR MULTIAC IR-FIX F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF POS TARG 1.057, 0.681 CUM (552.937 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ Q2123-0050 1 WFC3/IR MULTIAC IR-FIX F105W none none none none 1 N/A CUM Q2123-0050 2 WFC3/IR MULTIAC IR-FIX F105W none none none none 1 N/A CUM Q2123-0050 3 WFC3/IR MULTIAC IR-FIX F105W none none none none 1 N/A CUM Q2123-0050 4 WFC3/IR MULTIAC IR-FIX F105W none none none none 1 N/A CUM Q2123-0050 5 WFC3/IR MULTIAC IR-FIX F105W none none none none 1 N/A CUM 16891( 3) - 28-Feb-2022 22:22:33 - [ 4] Summary Form for Proposal 16891 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, NSAMP=6, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG 0.000, 0.000, POS TARG 0.352, 0.630, POS TARG 0.704, 0.051, POS TARG 1.057, 0.681, POS TARG 1.409, 0.101 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W ------------------------------------------------------------------------------------------------------------------------------------ Target Names Q2123-0050 ------------------------------------------------------------------------------------------------------------------------------------