15959( 7) - 05-Feb-2020 14:17:25 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15959 Version: 7 Check-in Time: 05-Feb-2020 14:17:25 STScI Edit Number: 3 Title Observations of the JWST/GTO Very Rich Cluster Lens RMJ121218.5+273255.1 ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Adi Zitrin Ben Gurion University of the Negev Y CoI: Dr. Mehmet Alpaslan New York University N CoI: Dr. Anton M. Koekemoer Space Telescope Science Institute N CoI: Dr. Dan Coe Space Telescope Science Institute - ESA N CoI: Dr. Christopher J. Conselice University of Nottingham N CoI: Dr. Jose M. Diego Instituto de Fisica de Cantabria N CoI: Prof. Brenda Louise Frye University of Arizona N CoI: Mr. Alex Griffiths University of Nottingham N CoI: Dr. Patrick Kelly University of Minnesota - Twin Cities N CoI: Prof. Rogier A. Windhorst Arizona State University N CoI: Dr. Steve Rodney University of South Carolina Research N Foundation CoI: Dr. Rolf A. Jansen Arizona State University N CoI: Prof. Steven L. Finkelstein University of Texas at Austin N CoI: Dr. Seth H. Cohen Arizona State University N CoI: Dr. Louis-Gregory Strolger Space Telescope Science Institute N CoI: Prof. Thomas J. Broadhurst University of the Basque Country N CoI: Prof. Haojing Yan University of Missouri - Columbia N CoI: Ms. Rebecca L. Larson University of Texas at Austin N CoI: Prof. J. Stuart B. Wyithe University of Melbourne N CoI: Dr. Mario Nonino INAF, Osservatorio Astronomico di Trieste N CoI: Ana Acebron Ben Gurion University of the Negev N ------------------------------------------------------------------------------------ Abstract 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 15959( 7) - 05-Feb-2020 14:17:25 - [ 2] cluster with the planned JWST observations. ------------------------------------------------------------------------------------ Observations Description ------------------------ 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. ------------------------------------------------------------------------------------ 15959( 7) - 05-Feb-2020 14:17:25 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RMJ121218.5+ CLUSTER OF GALAXIES, RA=12H12M19.2234S, J2000 V = 15 +/- 2 273255.1 GRAVITATIONAL LENS, DEC=+27D33'8.65" RICH CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 15959( 7) - 05-Feb-2020 14:17:25 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15959( 7) - 05-Feb-2020 14:17:25 - [ 5] Visit: 01 (Visit 1) Visit Requirements: SCHED 90% 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 RMJ121218.5 ACS/WFC ACCUM WFCENTER F435W 1 400 S POS TARG -6, -7.5; GS +273255.1 see below ACQ SCENARIO BASE1B3; (1934 S) PATTERN 4 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 RMJ121218.5 ACS/WFC ACCUM WFCENTER F814W 1 400 S POS TARG -6, -7.5 +273255.1 see below (1934 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0; GS ACQ +273255.1 CUM (402.936 SCENARIO BASE1B3 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F125W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 3 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F105W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 3 +273255.1 CUM (302.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 3 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 10 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F105W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 10 +273255.1 CUM (302.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F125W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 10 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.47425, 0.6055 +273255.1 CUM (402.936 S) ------------------------------------------------------------------------------------------------------------------------------------ 15959( 7) - 05-Feb-2020 14:17:25 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F435W 1 none none none 1 472.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F435W 2 none none none 1 472.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F435W 3 none none none 2 495.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F435W 4 none none none 2 495.0 S 1 RMJ121218.5+273255. 2 ACS/WFC ACCUM WFCENTER F814W 1 none none none 1 472.0 S 1 RMJ121218.5+273255. 2 ACS/WFC ACCUM WFCENTER F814W 2 none none none 1 472.0 S 1 RMJ121218.5+273255. 2 ACS/WFC ACCUM WFCENTER F814W 3 none none none 2 495.0 S 1 RMJ121218.5+273255. 2 ACS/WFC ACCUM WFCENTER F814W 4 none none none 2 495.0 S 1 RMJ121218.5+273255. 3 WFC3/IR MULTIAC IR-FIX F160W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 4 WFC3/IR MULTIAC IR-FIX F125W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 5 WFC3/IR MULTIAC IR-FIX F105W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 6 WFC3/IR MULTIAC IR-FIX F140W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 7 WFC3/IR MULTIAC IR-FIX F140W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 8 WFC3/IR MULTIAC IR-FIX F105W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 9 WFC3/IR MULTIAC IR-FIX F125W none none none none 3 N/A 1 CUM RMJ121218.5+273255. 10 WFC3/IR MULTIAC IR-FIX F160W none none none none 3 N/A 1 CUM 15959( 7) - 05-Feb-2020 14:17:25 - [ 7] Visit: 02 (Visit 2) Visit Requirements: SCHED 90%; AFTER 01 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 RMJ121218.5 ACS/WFC ACCUM WFCENTER F606W 1 400 S POS TARG -6, -7.5; GS +273255.1 see below ACQ SCENARIO BASE1B3; (1904 S) PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG 6.84275, +273255.1 CUM (402.936 0.30275; GS ACQ SCENARIO S) BASE1B3 ------------------------------------------------------------------------------------------------------------------------------------ 3 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F125W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 2 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F105W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 2 +273255.1 CUM (302.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 2 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F140W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 9 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F105W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF SAME POS AS 9 +273255.1 CUM (302.935 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F125W NSAMP=10, SAMP-SEQ=SPARS25 1 DEF SAME POS AS 9 +273255.1 CUM (227.937 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 RMJ121218.5 WFC3/IR MULTIAC IR-FIX F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG 7.317, 0.90825 +273255.1 CUM (402.936 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 | ------------------------------------------------------------------------------------------------------------------------------------ 15959( 7) - 05-Feb-2020 14:17:25 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F606W 1 none none none 1 476.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F606W 2 none none none 1 476.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F606W 3 none none none 1 476.0 S 1 RMJ121218.5+273255. 1 ACS/WFC ACCUM WFCENTER F606W 4 none none none 1 476.0 S 1 RMJ121218.5+273255. 2 WFC3/IR MULTIAC IR-FIX F160W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 3 WFC3/IR MULTIAC IR-FIX F125W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 4 WFC3/IR MULTIAC IR-FIX F105W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 5 WFC3/IR MULTIAC IR-FIX F140W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 6 WFC3/IR MULTIAC IR-FIX F140W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 7 WFC3/IR MULTIAC IR-FIX F105W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 8 WFC3/IR MULTIAC IR-FIX F125W none none none none 2 N/A 1 CUM RMJ121218.5+273255. 9 WFC3/IR MULTIAC IR-FIX F160W none none none none 2 N/A 1 CUM 15959( 7) - 05-Feb-2020 14:17:25 - [ 9] Summary Form for Proposal 15959 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=7, NSAMP=9, SAMP-SEQ=SPARS25, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01, GS ACQ SCENARIO BASE1B3, PATTERN 4 1, PATTERN 4 1-2, POS TARG -6, -7.5, POS TARG 0, 0, POS TARG 0.47425, 0.6055, POS TARG 6.84275, 0.30275, POS TARG 7.317, 0.90825, SAME POS AS 10, SAME POS AS 2, SAME POS AS 3, SAME POS AS 9, SCHED 90% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F125W, F140W, F160W, F435W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names RMJ121218.5+273255.1 ------------------------------------------------------------------------------------------------------------------------------------