15977( 2) - 15-Jul-2019 16:24:18 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15977 Version: 2 Check-in Time: 15-Jul-2019 16:24:18 STScI Edit Number: 0 Title Characterizing the Environment Around The Most Distant Known Galaxy ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Pascal Oesch Observatoire de Geneve Y CoI: Mr. Yoshinobu Fudamoto Observatoire de Geneve N CoI: Dr. Roberto Decarli INAF, Osservatorio di Astrofisica e N Scienza dello Spazio di B CoI: Dr. Fabian Walter Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Gabriel Brammer University of Copenhagen, Niels Bohr N Institute CoI: Dr. Erica Nelson Harvard University N CoI: Prof. Pieter van Dokkum Yale University N CoI: Dr. Rychard Bouwens Universiteit Leiden N CoI: Prof. Garth D. Illingworth University of California - Santa Cruz N CoI: Dr. Mauro Stefanon Universiteit Leiden N ------------------------------------------------------------------------------------ Abstract The discovery of the very luminous galaxy GN-z11 at only 400 Myr after the Big Bang in the GOODS-North field with an HST grism spectroscopic redshift of z=11.1+/-0.1 presents a real puzzle for early Universe science. Its detection raises significant questions about our understanding of early galaxy formation, as theoretical models did not predict any such galaxy in the small HST survey area. However, models do predict that the most luminous early galaxies form in the most massive halos, such that they should be significantly clustered, and surrounded by fainter neighbors. Two promising neighbor candidates have already been identified: one lower S/N source seen in HST imaging and one candidate from a NOEMA [CII] emission line search. Clearly, the GOODS-N field around GN-z11 represents the best chance to identify a larger number of z~11 sources that can immediately be followed up with JWST spectroscopy from day one. But already now, GN-z11 provides a unique window deep into cosmic dawn, before reionization occurs -- an epoch we thought was inaccessible before JWST. Here, we thus propose one pointing of deeper WFC3/IR imaging in three filters to fully characterize the z~11 environment around GN-z11 and to confirm its neighbor candidate galaxies. At the same time, these data will further constrain the morphology of GN-z11, and enhance the HST legacy in the prime extragalactic field GOODS-North for the JWST era. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program is aimed at the discovery of fainter neighbors around the currently most distant known galaxy GN-z11. It will provide 11 orbit WFC3/IR imaging split over three filters, as well as ACS F435W parallels back over the GOODS-North field. These data will be extremely valuable for the community to select targets for JWST spectroscopy follow-up, which is why we waive the 15977( 2) - 15-Jul-2019 16:24:18 - [ 2] proprietary time and submitted the proposal as JWST-initiative. It would be important to be able to schedule these data as quickly as possible before the JWST launch. For the filters F125W and F160W, we submit 2 visits of 2 orbits each, and for filter F140W, we created one 3-orbit visit. Each orbit is broken up into 4 WFC3/IR exposures and 4 ACS parallel exposures. The total integration time is thus 4 orbits in F125W and F160W and 3 orbits in F140W. We use a combination of two dither patterns, WFC3-IR-DITHER-BOX-MIN + WFC3-IR-DITHER-BLOB for the two orbit visits, and offset them using small POSTARGS for the next visit. 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. We apply a small constraint on the orients such that the parallel ACS images land back on the original GOODS field to improve the blue coverage and legacy. This only mildly reduces the scheduling opportunites, but if needed, this constraint could be weakened. Gyro mode failure: We do not expect a major impact on our observed program from a possible gyro failure. If the observing windows were to shrink, we can decrease the exposure times accordingly. ------------------------------------------------------------------------------------ 15977( 2) - 15-Jul-2019 16:24:18 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GN-Z11 GALAXY, HIGH REDSHIFT RA=12H36M25.4500S, J2000 H-band AB = 26.0 GALAXY DEC=+62D14'31.35" Reference Frame: Other: SIMBAD ------------------------------------------------------------------------------------------------------------------------------------ 15977( 2) - 15-Jul-2019 16:24:18 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 1.144 Line_Spacing 0.73 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 5.183 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 18.528 Angle_Between_Sides 74.653 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 15977( 2) - 15-Jul-2019 16:24:18 - [ 5] Visit: 01 (125-01) Visit Requirements: ORIENT 150D TO 355 D 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 GN-Z11 WFC3/IR MULTIAC IR-FIX F125W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF PATTERN 2 1-2; PAR 2 CUM (5623.476 WITH 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F435W 1 400 S see below (4774 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 | ------------------------------------------------------------------------------------------------------------------------------------ GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 1 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 2 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 3 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 4 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 1 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 2 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 3 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 4 none none 2 N/A CUM ANY 2 ACS/WFC ACCUM WFC F435W 1 1 none none 1 525.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 2 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 3 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 4 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 1 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 2 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 3 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 4 none none 2 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 6] Visit: 02 (125-02) Visit Requirements: ORIENT 150D TO 355 D 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 GN-Z11 WFC3/IR MULTIAC IR-FIX F125W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF POS TARG 2.0, -6.5; CUM (5623.476 PATTERN 2 1-2; PAR 2 S) WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F435W 1 400 S see below (4774 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 | ------------------------------------------------------------------------------------------------------------------------------------ GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 1 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 2 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 3 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 1 4 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 1 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 2 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 3 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F125W 2 4 none none 2 N/A CUM ANY 2 ACS/WFC ACCUM WFC F435W 1 1 none none 1 525.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 2 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 3 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 4 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 1 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 2 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 3 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 4 none none 2 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 7] Visit: 03 (160-01) Visit Requirements: ORIENT 150D TO 355 D 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 GN-Z11 WFC3/IR MULTIAC IR-FIX F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF PATTERN 2 1-2; PAR 2 CUM (5623.476 WITH 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F435W 1 400 S see below (4774 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 | ------------------------------------------------------------------------------------------------------------------------------------ GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 1 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 2 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 3 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 4 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 1 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 2 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 3 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 4 none none 2 N/A CUM ANY 2 ACS/WFC ACCUM WFC F435W 1 1 none none 1 525.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 2 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 3 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 4 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 1 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 2 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 3 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 4 none none 2 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 8] Visit: 04 (160-02) Visit Requirements: ORIENT 150D TO 355 D 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 GN-Z11 WFC3/IR MULTIAC IR-FIX F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF POS TARG 2.0, -6.5; CUM (5623.476 PATTERN 2 1-2; PAR 2 S) WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F435W 1 400 S see below (4774 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 | ------------------------------------------------------------------------------------------------------------------------------------ GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 1 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 2 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 3 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 1 4 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 1 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 2 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 3 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F160W 2 4 none none 2 N/A CUM ANY 2 ACS/WFC ACCUM WFC F435W 1 1 none none 1 525.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 2 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 3 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 4 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 1 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 2 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 3 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 4 none none 2 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 9] Visit: 05 (140-3orbits) Visit Requirements: ORIENT 150D TO 355 D 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 GN-Z11 WFC3/IR MULTIAC IR-FIX F140W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF PATTERN 2 1-2; PAR 2 CUM (5623.476 WITH 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY ACS/WFC ACCUM WFC F435W 1 400 S see below (4774 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GN-Z11 WFC3/IR MULTIAC IR-FIX F140W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF POS TARG 2.0, -6.0; CUM (2811.754 PATTERN 1 3-4; PAR 4 S) WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY ACS/WFC ACCUM WFC F435W 1 325.0 S see below (2428 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 | ------------------------------------------------------------------------------------------------------------------------------------ GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 1 1 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 1 2 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 1 3 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 1 4 none none 1 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 2 1 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 2 2 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 2 3 none none 2 N/A CUM GN-Z11 1 WFC3/IR MULTIAC IR-FIX F140W 2 4 none none 2 N/A CUM ANY 2 ACS/WFC ACCUM WFC F435W 1 1 none none 1 525.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 2 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 3 none none 1 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 1 4 none none 1 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 10] 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 | ------------------------------------------------------------------------------------------------------------------------------------ ANY 2 ACS/WFC ACCUM WFC F435W 2 1 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 2 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 3 none none 2 607.0 S ANY 2 ACS/WFC ACCUM WFC F435W 2 4 none none 2 607.0 S GN-Z11 3 WFC3/IR MULTIAC IR-FIX F140W 1 none none none 3 N/A CUM GN-Z11 3 WFC3/IR MULTIAC IR-FIX F140W 2 none none none 3 N/A CUM GN-Z11 3 WFC3/IR MULTIAC IR-FIX F140W 3 none none none 3 N/A CUM GN-Z11 3 WFC3/IR MULTIAC IR-FIX F140W 4 none none none 3 N/A CUM ANY 4 ACS/WFC ACCUM WFC F435W 1 none none none 3 607.0 S ANY 4 ACS/WFC ACCUM WFC F435W 2 none none none 3 607.0 S ANY 4 ACS/WFC ACCUM WFC F435W 3 none none none 3 607.0 S ANY 4 ACS/WFC ACCUM WFC F435W 4 none none none 3 607.0 S 15977( 2) - 15-Jul-2019 16:24:18 - [ 11] Summary Form for Proposal 15977 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=15, NSAMP=8, SAMP-SEQ=SPARS100, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 150D TO 355 D, PAR 2 WITH 1, PAR 4 WITH 3, PATTERN 1 3-4, PATTERN 2 1-2, POS TARG 2.0, -6.0, POS TARG 2.0, -6.5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F125W, F140W, F160W, F435W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ANY, GN-Z11 ------------------------------------------------------------------------------------------------------------------------------------