0 Assigned ID: 3028 ----- Attempting Submission 1 (Thu Mar 24 18:17:40 GMT 2022) ----- HST Phase I Proposal 3028 successfully submitted. Receipt: # 3028-1 0 ----- Attempting Submission 1 (Tue Jul 12 08:43:54 GMT 2022) ----- Characterizing Growth and Quenching Pathways of the Most Massive Galaxies at 3<z<4 One of the biggest tensions between observations and theory lies in the existence of quiescent ultra-massive galaxies (UMGs) recently confirmed at z>3. Understanding how the star formation activity is halted is one of the most important outstanding problems in galaxy evolution, but the physics of this quenching remain uncertain. Multiple processes have been proposed with different timescales. The simultaneous measurements of star-formation histories and stellar mass density represent the most promising way to discriminate between them. However, little is known about the sizes and structures of UMGs at z>3. Recently, the largest sample to-date of UMGs (Mstar>10^11 Msun) at 3<z<4 has been spectroscopically confirmed by the MAGAZ3NE survey. The proposed program will provide deep F160W imaging for all MAGAZ3NE UMGs, enabling the measurement, for the first time, of size, structure, and central stellar mass density within 1 kpc for a representative sample of 16 spectroscopically confirmed UMGs at 3<z<4. This knowledge will inform us on the formation and quenching mechanisms, and we will investigate the connection between quenching and morphological transformation. We will constrain the pair fractions, quantifying systematic effects of blending on the number density of UMGs at 3<z<4, which provides very strong constraints on models of galaxy formation. Finally, for the quiescent UMGs (~1/2 of the sample), we will derive dynamical masses by combining size and Sersic index measurements with their stellar velocity dispersions, investigating the dynamical-to-stellar mass ratios and placing constraints on the IMF in 3<z<4 UMGs. This is a program to obtain WFC3/IR observations in the F160W filter of 12 high-redshift galaxies. The galaxies are quite bright. Each observatio will be carried out using a non pre-defined dithering pattern, composed of 4 dithers. The dithering pattern is the same used in another 2 successfuls programs (12328 and 12990). The coordinates of two targets have been slightly corrected with respect to those defined in Phase-1. The proposed program will result in F160W images of 12 objects. We will work closely together to perform the data reduction. The photometry modeling will be led by Dr Annunziatella, with contributions from the rest of the team. The members of our team have extensive experience with HST imaging data, SED modeling, and with galaxy evolution science. Among the CoIs of this proposal are experts of several scientific areas, such as galaxies at z~1-4 (Marchesini, Marsan, Muzzin, Wilson), distant clusters of galaxies and environmental studies (Annunziatella, Muzzin, Wilson), morphology studies (Annunziatella, Marsan). Dr. Ben Forrest is an expert in massive galaxy formation and evolution at high redshifts, and is a leader of the MAGAZ3NE team. Together, this team has significant experience with analysis of high redshift massive galaxies, technical expertise in near-infrared and space-based data reduction, and a strong record of impactful publications which will maximize the science outputs from the observations in this program. The entire team (including graduate students) are committed to rapidly process the proposed data and to return reduced high-level science products to the community as quickly as possible, as demonstrated by the record of publications of the proposing team. Galaxies 6 false false false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=21.94 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.25 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.63 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.47 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.95 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.70 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.46 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=23.51 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.58 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=22.61 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=21.32 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H=21.10 WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F160W The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 09:50:47.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "02" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:22:16.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "03" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:25:06.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "04" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:40:46.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "05" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:39:49.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "06" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:45:19.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "06" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "07" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:46:30.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "07" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "08" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:50:50.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "08" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "09" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:51:37.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "09" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "10" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:52:26.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "10" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17226 :visit-id "11" :proposal-version -1 :trans-version "20220516" :date "11-Jul-2022 10:53:08.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17226 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17226 :visit-id "11" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3145 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. 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