0 Assigned ID: 395 ----- Attempting Submission 1 (Fri Apr 05 10:54:18 GMT 2019) ----- ORBITAL VISIBILITY OVERRUN Resubmission changing STEP100 to SPARS50 for visits 6 and 10. 261833107 ----- Attempting Submission 1 (Mon Jul 08 10:28:48 GMT 2019) ----- HST Phase II Proposal 15910 (Cy27_R1001.apt) successfully submitted. Receipt: # 15910-1 ----- Attempting Submission 2 (Thu Jul 11 08:49:47 GMT 2019) ----- HST Phase II Proposal 15910 (Cy27_R1001.apt) successfully submitted. Receipt: # 15910-2 ----- Attempting Submission 3 (Fri Jul 12 06:42:02 GMT 2019) ----- ----- Attempting Submission 4 (Thu Jul 18 15:42:02 GMT 2019) ----- ----- Attempting Submission 5 (Thu Sep 19 21:04:05 GMT 2019) ----- This 1s overrun has been validated and agreed with the contact scientist, Marc Rafelski. Galaxy evolution in a massive z=2.91 halo fed by cold accretion We have recently discovered and spectroscopically confirmed a structure consistent with a forming, single massive halo at z=2.91 in the COSMOS field. With a total mass estimated at about 5x10^13, this is the highest redshift bonafide cluster/group known to date. Keck/KCWI observations revealed a luminous Lya nebula well centered on the stellar mass overdensity, surrounded by three filaments with a factor of 10 lower surface brightness, extending over a 320pkpc diameter out to the virial radius. A variety of observables suggest that we are in presence of a textbook-case of cold accretion onto a massive high-z halo. The existing multiwavelength data, including the COSMOS single orbit with F814W, only scratch the surface of the galaxy content of this system. We propose 11 orbits of HST imaging with WFC3IR in F160W/F125W and WFC3/UV F606W that will allow us to obtain a complete census of the galaxies inhabiting this structure down to low stellar masses, together with passive/star forming classification and morphological information. The bluer filters will unveil any unreddened star formation down to very deep levels, complementing the information about dust-obscured star formation from ALMA, NOEMA, and radio. We will be able to distinguish physical properties of galaxies located in the halo core, in the accreting filaments, and outside of them. Given the importance to study galaxy transformations, quenching, and the role of gas accretion on galaxy evolution in massive halos at the highest possible redshift, this program represents a unique opportunity of carrying out this kind of investigation at the frontiers of current knowledge. This is a simple WFC3 imaging proposal of a single target in 3 filters. We have defined a single visit for observations in F606W and F125W, in order to have control on the resulting dithering pattern which will optimize coverage and PSF reconstruction. The 5 orbits of F160W imaging are split into two visits to easy scheduling. We have substantial experience with the use of HST observations. We have been PIs of several HST programs targeting in particular the cluster Cl J1449 at z=1.99, and involved in several others targeting Cl 1001 at z=2.51, and other high redshift clusters. This include programs with PI Daddi: 11174 in Cycle16, 11648 in Cycle17, and more recently 15229 in Cycle 25, those with PI Strazzullo including 12991 in Cycle20 and 14252 in Cycle23. Rich has been PI of more than 20 HST programs so far. These HST programs produced a substantial number of publications, of order of 20-30 papers either as primary datasets or as ancillary. We have substantial expertise with HST imaging data reduction, with morphological analysis using galfit and other tools, with stellar population modeling both for integrated emission and pixel by pixel. Cosmology Galaxies and the IGM 6 false false false false false false false SUPPORTED CLUSTER OF GALAXIES EMISSION LINE NEBULA J2000 J2000 WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F125W WFC3/UVIS Imaging No No F606W POS-TARG DITHER DITHER 3 5.183 WFC3-IR-DITHER-LINE true true 0.636 5 41.859 POS-TARG WFC3-IR-DITHER-BLOB 41.788 3 true POS-TARG DITHER DITHER 5 5.183 WFC3-IR-DITHER-LINE true true 0.636 3 41.859 POS-TARG WFC3-IR-DITHER-BLOB 41.788 4 true POS-TARG DITHER DITHER 5 5.183 WFC3-IR-DITHER-LINE false true 0.636 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 41.788 5 true POS-TARG MOSAIC DITHER 3 2.414 WFC3-UVIS-DITHER-LINE-3PT false true 1.485 2 85.759 POS-TARG WFC3-UVIS-GAP-LINE 46.84 6 true The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1585559252000 90.0 (Tic-Visit :proposal-id 15910 :visit-id "01" :proposal-version -1 :trans-version "20190514" :date "17-Sep-2019 16:32:46.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3133568 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15910 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15910 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "01" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "01" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2805 :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 3 0 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1585576410000 90.0 (Tic-Visit :proposal-id 15910 :visit-id "06" :proposal-version -1 :trans-version "20190514" :date "17-Sep-2019 16:35:59.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3133568 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15910 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15910 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2810 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "06" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2815 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "06" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2810 :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 3 1 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1585896705000 90.0 (Tic-Visit :proposal-id 15910 :visit-id "09" :proposal-version -1 :trans-version "20190514" :date "18-Jul-2019 17:31:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15910 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15910 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2808 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "09" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2808 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "09" :orbit-number 3 :pcs-time 302 :si-vis-utilization 2808 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 27.2. CASM was run in Phase II mode. 1585399116000 98.32061700146909 (Tic-Visit :proposal-id 15910 :visit-id "10" :proposal-version -1 :trans-version "20190514" :date "17-Sep-2019 16:36:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2089040 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15910 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15910 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "10" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) true 2 0 (Tic-Visit :proposal-id 15910 :visit-id "10" :proposal-version -1 :trans-version "20190514" :date "17-Sep-2019 16:36:28.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2089040 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15910 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15910 :visit-id "10" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15910 :visit-id "10" :orbit-number 2 :pcs-time 302 :si-vis-utilization 2805 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3142 :pcs-gap 0 ) false 2 0