0 Assigned ID: 738 ----- Attempting Submission 1 (Fri Apr 07 18:50:40 GMT 2017) ----- HST Phase I Proposal 738 (debarros.apt) failed submission. ----- Attempting Submission 2 (Fri Apr 07 18:52:36 GMT 2017) ----- HST Phase I Proposal 738 (debarros.apt) failed submission. ----- Attempting Submission 3 (Fri Apr 07 18:53:07 GMT 2017) ----- HST Phase I Proposal 738 (debarros.apt) failed submission. ----- Attempting Submission 4 (Fri Apr 07 18:53:37 GMT 2017) ----- ----- Attempting Submission 5 (Fri Apr 07 19:03:02 GMT 2017) ----- HST Phase I Proposal 738 (debarros.apt) successfully submitted. Receipt: # 738-5 ----- Attempting Submission 6 (Fri Apr 07 19:13:17 GMT 2017) ----- HST Phase I Proposal 738 (debarros.apt) successfully submitted. Receipt: # 738-6 ----- Attempting Submission 7 (Fri Apr 07 20:32:30 GMT 2017) ----- This submission includes three main changes: 1) vastly increased the schedulability by relaxing the orient constraints for the parallel fields 2) further hoped to increase schedulability by going to two rather than three-orbit visits 3) packaging every orbit into a non-int sequence to ensure that F105W images are taken away from Earth limb 4) no longer any Orbital Visibility Overruns in the Orbit Planner -377636953 ----- Attempting Submission 1 (Fri Jul 14 14:29:21 GMT 2017) ----- ----- Attempting Submission 2 (Wed Sep 06 09:25:39 GMT 2017) ----- ----- Attempting Submission 3 (Thu Dec 13 16:21:29 GMT 2018) ----- Beacons in the dark: using the most distant galaxies to probe cosmic reionization One of the major unresolved problems in modern cosmology is when and how the universe was ionized. The consensus scenario is that ultra-faint, low-mass galaxies contributed most to the UV background at high-redshift and that reionization was an inhomogeneous process, with ionized bubbles created first around galaxy overdensities. The very surprising discovery of Ly-alpha emission lines around a large fraction of the most luminous galaxies at z=7.4-8.7, when we expect the universe to be highly neutral, could thus be explained by the fact that they lie in large HII bubbles which were ionized thanks to yet undetected fainter neighbors. Theoretical models indeed predict a boost of up to 6x larger galaxy counts around the brightest sources compared to the general field, when probing down to luminosities as faint as 0.1L_UV of the central source. Here we propose a direct test of these models by searching for fainter neighbors around three bright z>7.4 galaxies emitting Ly-alpha, including two sources that lie only 9 Mpc from each other and could share the same ionized bubble, as well as the most distant confirmed Ly-alpha emitter EGSY-8p7 at z=8.68. Given the expected overdensities, we have the opportunity to detect 20 (and up to 50) new z~7-9 galaxies with only a modest investment of HST time. These observations are thus maximally efficient at providing a large number of precious high-redshift targets for early JWST spectroscopy to directly study the galaxies that are in the process of ionizing the universe. Our imaging will further enhance the legacy of the CANDELS/EGS field, and we will make the reduced data available to the community immediately for JWST follow-up. This program is aimed at the discovery of fainter neighbors around three, very luminous z>7 galaxies in the CANDELS/EGS field that were first discovered in Roberts-Borsani et al. (2015). It will provide 6 orbit WFC3/IR imaging split over three filters, as well as ACS F435W parallels back over the CANDELS field, whenever possible by scheduling. These data will be extremely valuable for the community to select targets for JWST spectroscopy follow-up, which is why we waive the proprietary time and submitted the proposal as JWST-initiative. It would be important to be able to schedule these data *before* the JWST cycle 1 deadline. The orient constraints were relaxed somewhat in order to allow for efficient scheduling early on in the HST cycle, meaning that the overlap with the parallel data and the original CANDELS imaging may not be 100%. For each of the three targets we submit three visits of 2 orbits each. The orbits are broken up into 4 WFC3/IR exposures and 4 ACS parallel exposures. In order to minimize the impact of a time-variable background due to excess Earth-glow (ISR WFC3-2014-03), we only take F105W images in the middle of each orbit, and F125W or F160W at the beginning and the end. To ensure that the exposures are taken in this sequence within one physical orbit, we packaged each orbit into a Non-Int sequence. This results in the required total exposure time of 3 orbits in F105W and 1.5 orbits in F125W and F160W, that is optimal for the selection of high-redshift galaxies. We use POSTARGs to dither each exposure. The dither pattern was chosen as a combination of WFC3-IR-DITHER-BLOB and a 3 point line dither. This ensures that both the WFC3/IR images as well as the ACS parallels are well dithered, and we step across the ACS chip gap. The same pattern is repeated with a 1.5 pixel offset in the second half of the orbits for each target in order to improve the sampling of the PSF of the F105W images (which are taken in all visits). The pointing of the last target (EGSY8p7), which lies close to the border of the CANDELS imaging, was offset slightly in order to ensure maximal overlap with the existing data. Galaxies and the IGM 0 false false false false true false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 H-band mag: 25 GALAXY HIGH REDSHIFT GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 H-band mag: 25 GALAXY HIGH REDSHIFT GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 H-band mag: 25 WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F435W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F435W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F435W The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 15103 :visit-id "02" :proposal-version -1 :trans-version "20181130" :date "13-Dec-2018 14:31:27.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "02" :orbit-number 2 :pcs-time 302 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15103 :visit-id "03" :proposal-version -1 :trans-version "20181130" :date "13-Dec-2018 14:26:23.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "03" :orbit-number 2 :pcs-time 302 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /private/var/folders/z3/xy_g1v_s5fz9yrhzb8thz4cr0001qc/T/OPVisit13699300678145698088.xml (Tic-Visit :proposal-id 15103 :visit-id "04" :proposal-version -1 :trans-version "20181130" :date "18-Dec-2018 11:08:18.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "04" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "04" :orbit-number 2 :pcs-time 256 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /private/var/folders/z3/xy_g1v_s5fz9yrhzb8thz4cr0001qc/T/OPVisit10980988943886828351.xml (Tic-Visit :proposal-id 15103 :visit-id "05" :proposal-version -1 :trans-version "20181130" :date "18-Dec-2018 11:09:02.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "05" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "05" :orbit-number 2 :pcs-time 256 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. /private/var/folders/z3/xy_g1v_s5fz9yrhzb8thz4cr0001qc/T/OPVisit5670352437137242783.xml (Tic-Visit :proposal-id 15103 :visit-id "06" :proposal-version -1 :trans-version "20181130" :date "18-Dec-2018 11:08:24.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "06" :orbit-number 1 :pcs-time 241 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "06" :orbit-number 2 :pcs-time 256 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15103 :visit-id "07" :proposal-version -1 :trans-version "20181130" :date "13-Dec-2018 14:32:48.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "07" :orbit-number 2 :pcs-time 302 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15103 :visit-id "08" :proposal-version -1 :trans-version "20181130" :date "13-Dec-2018 14:33:58.0" :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 4484736 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15103 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15103 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2957 :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 3333 :pcs-gap 0 ) (Tic-Orbit :proposal-id 15103 :visit-id "08" :orbit-number 2 :pcs-time 302 :si-vis-utilization 3007 :al-overhead-at-end 0 :internal-dur-at-end 866 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3333 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 26.2.2. 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