0 Assigned ID: 150 ----- Attempting Submission 1 (Wed Apr 03 20:17:40 GMT 2019) ----- HST Phase I Proposal 150 (z6longarc.apt) successfully submitted. Receipt: # 150-1 ----- Attempting Submission 2 (Wed Apr 03 20:34:32 GMT 2019) ----- HST Phase I Proposal 150 (z6longarc.apt) successfully submitted. Receipt: # 150-2 ----- Attempting Submission 3 (Thu Apr 04 04:43:01 GMT 2019) ----- HST Phase I Proposal 150 (z6longarc.apt) successfully submitted. Receipt: # 150-3 ----- Attempting Submission 4 (Thu Apr 04 19:09:59 GMT 2019) ----- HST Phase I Proposal 150 (z6longarc.apt) successfully submitted. Receipt: # 150-4 ----- Attempting Submission 5 (Thu Apr 04 23:53:18 GMT 2019) ----- HST Phase I Proposal 150 (z6longarc.apt) successfully submitted. Receipt: # 150-5 ----- Attempting Submission 6 (Fri Apr 05 13:23:24 GMT 2019) ----- Optimally packed the orbits 224168239 ----- Attempting Submission 1 (Thu Jul 25 20:10:43 GMT 2019) ----- HST Phase II Proposal 15842 (15842.apt) successfully submitted. Receipt: # 15842-1 ----- Attempting Submission 2 (Thu Jul 25 20:29:44 GMT 2019) ----- HST Phase II Proposal 15842 (15842.apt) successfully submitted. Receipt: # 15842-2 ----- Attempting Submission 3 (Fri Jul 26 03:20:40 GMT 2019) ----- Unprecedented Spatial Resolution in a Strongly Magnified z ~ 6 Galaxy The combined powers of HST and gravitational lensing have delivered strongly magnified images of distant galaxies, revealing detailed structures at ~100 pc resolution or better at z ~ 1 - 5. Here we propose to extend that work to z ~ 6 and reveal the highest spatial resolutions yet studied at z > 1. The RELICS HST Treasury Program recently yielded the longest lensed image of any galaxy at z ~ 6, observed in the first billion years. The shallow WFC3/IR imaging was only sufficient to detect the brightest star-forming knots, while the ACS imaging did not significantly detect any of the knots individually. Here we propose deeper ACS F814W imaging to reveal unprecedented levels of spatial detail, resolving star forming clumps as small as r ~ 20 pc. We also propose deeper WFC3/IR imaging in F110W to reveal the full extent of the arc. Finally we add bluer imaging with ACS F475W. The combined data will critically enable us to identify other multiply-imaged galaxies, significantly improving the strong lens model. Based on these new data, this exceptional 15" long z ~ 6 arc will enable us to study star formation efficiency in clumps smaller than r ~ 100 pc for the first time at this epoch. This type of science has been envisioned for the ELTs and LUVOIR; we will do it now with HST. We waive any proprietary period to these data, in the spirit of the RELICS observing program that led to this discovery. This program will obtain 9 orbits of HST imaging on the core of the galaxy cluster WHL0137-08 and a parallel field. The imaging overlaps the existing RELICS imaging, both the prime and parallel fields. We divide our 9 orbits among 3 filters: 2 orbits ACS F475W 5 orbits ACS F814W 2 orbits WFC3/IR F110W For every filter, we split our observations between two epochs separated by 20+ days to enable a search for supernovae and other transients. Within each orbit, we will obtain 4 exposures in a single filter, using small dithers to optimally sample the PSF. Between orbits, we will perform larger dithers to cover the ACS chip gap and WFC3/IR death star. The desired orient roll angle is 60.6 deg to best overlap the existing RELICS HST imaging. The 2 orbits of ACS parallels (with WFC3 in prime) would land on the RELICS WFC3 imaging. The 7 orbits of WFC3 parallels (with ACS in prime) would create a new parallel field. This roll angle is rotated 180 degrees from that performed by RELICS. EARLY SCHEDULING prior to the JWST call for proposal deadline is our priority, if possible. Therefore, we relax our roll constraints to 50 - 75 deg to increase schedulability. This range still provides decent overlap with the RELICS archival HST imaging. All Co-I's are team members of the HST Treasury Program RELICS that obtained the existing imaging. Dan Coe is the PI. Brett Salmon discovered the z ~ 6 arc. Our high-z experts include Dan Coe, Brett Salmon, Marusa Bradac, Larry Bradley, Pascal Oesch, Michele Trenti, and Masami Ouchi. Our lens modeling experts are Keren Sharon, Adi Zitrin, Guillaume Mahler, Ana Acebron, Brian Welch, Marusa Bradac, and Dan Coe. Keren Sharon led studies of a similarly spectacular lensed arc at z = 1.7. Roberto Avila and Sara Ogaz reduced the RELICS HST images. Roberto Avila is Deputy Manager of the ACS Instrument Team. Steve Rodney and Lou Strolger lead our supernova searches. Marusa Bradac is PI of the Spitzer observations. Victoria Strait obtained the Spitzer photometry. Cosmology Galaxies and the IGM 0 false false false false false false false SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS RICH CLUSTER J2000 J2000 ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F110W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F606W WFC3/IR Imaging No No F105W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F160W Timing link suitability includes constraints ([4X After 4A by 20.0 to 360.0 days]) Hst Same orient constraint links visits (4A 4X 8A 8B 8C 8X 8Y) The scheduling data was generated by CASM 27.2. 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