0 Assigned ID: 59 ----- Attempting Submission 1 (Mon Apr 01 08:09:53 GMT 2019) ----- HST Phase I Proposal 59 (Cycle27_RMJ1212_5orbits.apt) successfully submitted. Receipt: # 59-1 ----- Attempting Submission 2 (Thu Apr 04 08:51:45 GMT 2019) ----- Improved schedulability by reducing exposure times. (Set SCHED 90 to reduce observability windows.) -83237821 ----- Attempting Submission 1 (Wed Jul 24 12:40:03 GMT 2019) ----- ----- Attempting Submission 2 (Thu Jul 25 15:37:41 GMT 2019) ----- HST Phase II Proposal 15959 (15959.apt) successfully submitted. Receipt: # 15959-2 ----- Attempting Submission 3 (Thu Jul 25 17:41:32 GMT 2019) ----- Observations of the JWST/GTO Very Rich Cluster Lens RMJ121218.5+273255.1 RMJ121218.5+273255.1 (redshift z=0.35) is amongst the top 1% richest clusters in the redMaPPer catalog. It is significantly detected in X-ray and through the Sunyaev-Zeldovich effect in ROSAT and Planck data, respectively, and its optical luminosity predicts a big lens (Einstein radius of ~40") based on mass-to-light scaling relations. As such, it was chosen for the Webb Medium Deep Fields (WMDF) JWST/GTO program. Deep ground-based imaging we recently obtained reveals several multiply imaged candidates to large radii, suggesting that RMJ1212 is indeed a large lens. However, the cluster lacks any HST imaging, whose resolution is crucial for identifying morphological details and securing the identification of lensed features. We request 5 orbits split over 7 HST filters in the optical and near-infrared to securely identify multiple images and measure their photometric redshifts, so that a lens model for this cluster could be published in time for JWST. The requested observations will also, importantly, constitute a baseline towards finding transient sources in the planned JWST observations, and, will allow us to readily identify bright, lensed high-redshift candidates for spectroscopic follow-up. In addition, we note that given the limited blue wavelength coverage by JWST/NIRCam, the requested optical observations are necessary for identifying high-z objects behind this cluster with the planned JWST observations. We adopt the filter choice of recent lensing surveys such as the Hubble Frontier Fields and RELICS, and an observing strategy similar to that of RELICS. We will use three orbits divided between the F435W, F606W, and F814W filters with the Advanced Camera for Surveys (ACS), and two additional orbits divided among the four WFC3/IR filters (F105W, F125W, F140W, and F160W). We use non-integer pixel, 4-point dithering between exposures to improve the PSF sampling. Dr. Adi Zitrin has expertise in lens modeling, including discovering some of the largest lenses known, and in high-redshift galaxy studies. Dr. Zitrin and Prof. Tom Broadhurst, who has expertise in lensing, cosmology and galaxy cluster studies, have written a common lensing code dubbed LTM. Dr. Jose Diego has written a hybrid lensing code (WSLAP+) and has extensive experience in cosmology and galaxy cluster studies using various probes including X-ray and the SZ effect. Dr. Dan Coe has expertise in lensing cluster and high-redshift galaxy studies and has written a non-parametric lensing code. Dr. Ana Acebron has experience in lens modeling and investigating systematics between various techniques. Prof. Steve Finkelstein has expertise in high-redshift galaxy studies and reionization. Ms. Rebecca Larson is a student of Prof. Finkelstein. Prof. Stuart Wyithe has expertise in studying the first galaxies and reionization. Prof. Rogier Windhorst has expertise in galaxy formation and evolution, has been part of the JWST First Science working group, and is PI of the Webb Medium Deep Fields JWST/GTO program. Prof. Brenda Frye has expertise in lens modeling and in galaxy formation and evolution. Dr. Mehmet Alpaslan, Prof. Chris Conselice, Prof. Haojing Yan, Dr. Rolf Jansen, Dr. Seth Cohen, and Dr. Mario Nonino, have extensive expertise in galaxy formation and evolution and/or in galaxy cluster studies. Mr. Alex Griffiths is a student of Prof. Conselice. Dr. Anton Koekemoer has expertise in HST observations and their data reduction. Dr. Lou Strolger, Dr. Steve Rodney, and Dr. Pat Kelly, have expertise in transient studies, including the discoveries of various supernovae and caustic crossing events in lensing clusters. In summary, the team has extensive experience (including with HST) to conduct all aspects of the proposed science. 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