17431( 3) - 03-Sep-2024 16:59:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17431 Version: 3 Check-in Time: 03-Sep-2024 16:59:26 STScI Edit Number: 1 Title A Remarkable Wide Separation Lensed Quasar ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Michael D. Gladders University of Chicago Y CoI: Prof. Keren Sharon University of Michigan N CoI: Dr. Haakon Dahle University of Oslo N ------------------------------------------------------------------------------------ Abstract We propose broadband HST imaging of a newly discovered wide-separation lensed quasar (WSLQ). There are only 7 WSLQs in the literature from 20 years of searching, and this new WSLQ is spectacular. The lensing cluster at z=0.42 is the most massive WSLQ lens found to date and is lensing a low luminosity quasar at z=1.524; initial ground-based imaging and spectroscopy shows four other obvious multiply-imaged sources, one of which is a second multiply-imaged AGN (obscured in this case, but readily apparent from emmission lines) at z=1.939. Both lensed AGN have multiply-imaged companion galaxies, and the foreground quasar shows numerous MgII absorbers - one of which matches one of the spectroscopically confirmed companions. Remarkably, the host galaxy of the quasar is also evident in ground-based NIR imaging, and so HST resolution will allow for a probe of quasar feedback in the host from color gradients. The scientific possibilities with this new discovery are manifold; we propose here a modest 8-orbit imaging program to acquire the data necessary to immediately build a robust strong lens model, which will rapidly unlock the potential of this new discovery. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is a 5-band imaging program of a newly discoverd wide-separation lensed quasar. The 8 allocated orbits are split into three 2-orbit visits for observations in 3 ACS filters, plus one 2-orbit visits for observations in 2 WFC3-IR filters. The ACS observations have the strong-lensing center centered on Chip 1, which keeps the entire region of high magnification (in which objects of interest appear) within one chip regardless of roll angle. Across two orbits (for each filter) we use a total of 8 exposures, with a 2-point ACS-WFC-DITHER-LINE to span the chip gap between orbits, and a 4-point ACS-WFC-DITHER-BOX within each orbit to sample the PSF and reject outliers of various sorts. No post-flash is neede in any of these observations. The WFC3-IR observations are centered on the single decector, sufficient to map the whole region of high lensing magnification regardless of roll angle. Each filter gets 6 integrations; we've choseen to do a manual postarg for each orbit that replicates the WFC3-IR-DITHER-BLOB pattern in order to have maximum 17431( 3) - 03-Sep-2024 16:59:26 - [ 2] control over NSAMP/SAMPSEQ value and optimize orbit packing. This is coupled with the WFC3-IR-DITHER-LINE-3PT pattern within each filter in each orbit for PSF sampling. ------------------------------------------------------------------------------------ 17431( 3) - 03-Sep-2024 16:59:26 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 COOLJ1153 CLUSTER OF GALAXIES, RA=11H53M19.2500S, J2000 V = 21 GRAVITATIONAL LENS, DEC=+07D55'57.20" RICH CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17431( 3) - 03-Sep-2024 16:59:26 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE ACS-WFC-DITHER-BOX Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 3.034 0.2637 Line_Spacing 0.1856 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 20.7 Angle_Between_Sides 69.02 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17431( 3) - 03-Sep-2024 16:59:26 - [ 5] Visit: 01 Visit Requirements: 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 COOLJ1153 ACS/WFC ACCUM WFC1 F475W 1 500 S PATTERN 1 1 see below (3925 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 | ------------------------------------------------------------------------------------------------------------------------------------ COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 1 1 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 1 2 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 1 3 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 1 4 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 2 1 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 2 2 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 2 3 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F475W 2 4 none none 2 497.0 S 17431( 3) - 03-Sep-2024 16:59:26 - [ 6] Visit: 02 Visit Requirements: 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 COOLJ1153 ACS/WFC ACCUM WFC1 F606W 1 500 S PATTERN 1 1 see below (3925 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 | ------------------------------------------------------------------------------------------------------------------------------------ COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 1 1 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 1 2 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 1 3 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 1 4 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 2 1 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 2 2 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 2 3 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F606W 2 4 none none 2 497.0 S 17431( 3) - 03-Sep-2024 16:59:26 - [ 7] Visit: 03 Visit Requirements: 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 COOLJ1153 ACS/WFC ACCUM WFC1 F814W 1 500 S PATTERN 1 1 see below (3925 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 | ------------------------------------------------------------------------------------------------------------------------------------ COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 1 1 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 1 2 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 1 3 none none 1 484.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 1 4 none none 1 483.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 2 1 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 2 2 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 2 3 none none 2 498.0 S COOLJ1153 1 ACS/WFC ACCUM WFC1 F814W 2 4 none none 2 497.0 S 17431( 3) - 03-Sep-2024 16:59:26 - [ 8] Visit: 04 Visit Requirements: 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 COOLJ1153 WFC3/IR MULTIAC IR F105W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG -1.82793, CUM (1208.808 -1.82793; PATTERN 3 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 COOLJ1153 WFC3/IR MULTIAC IR F125W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG -1.82793, CUM (1058.806 -1.82793; PATTERN 3 2 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 COOLJ1153 WFC3/IR MULTIAC IR F105W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.82793, CUM (1058.806 1.82793; PATTERN 3 3 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 COOLJ1153 WFC3/IR MULTIAC IR F125W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.82793, CUM (1208.808 1.82793; PATTERN 3 4 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 | ------------------------------------------------------------------------------------------------------------------------------------ COOLJ1153 1 WFC3/IR MULTIAC IR F105W 1 none none none 1 N/A CUM COOLJ1153 1 WFC3/IR MULTIAC IR F105W 2 none none none 1 N/A CUM COOLJ1153 1 WFC3/IR MULTIAC IR F105W 3 none none none 1 N/A CUM COOLJ1153 2 WFC3/IR MULTIAC IR F125W 1 none none none 1 N/A CUM COOLJ1153 2 WFC3/IR MULTIAC IR F125W 2 none none none 1 N/A CUM COOLJ1153 2 WFC3/IR MULTIAC IR F125W 3 none none none 1 N/A CUM COOLJ1153 3 WFC3/IR MULTIAC IR F105W 1 none none none 2 N/A CUM COOLJ1153 3 WFC3/IR MULTIAC IR F105W 2 none none none 2 N/A CUM COOLJ1153 3 WFC3/IR MULTIAC IR F105W 3 none none none 2 N/A CUM COOLJ1153 4 WFC3/IR MULTIAC IR F125W 1 none none none 2 N/A CUM 17431( 3) - 03-Sep-2024 16:59:26 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ COOLJ1153 4 WFC3/IR MULTIAC IR F125W 2 none none none 2 N/A CUM COOLJ1153 4 WFC3/IR MULTIAC IR F125W 3 none none none 2 N/A CUM 17431( 3) - 03-Sep-2024 16:59:26 - [ 10] Summary Form for Proposal 17431 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=8, NSAMP=9, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 3 1, PATTERN 3 2, PATTERN 3 3, PATTERN 3 4, POS TARG -1.82793, -1.82793, POS TARG 1.82793, 1.82793 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F125W, F475W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names COOLJ1153 ------------------------------------------------------------------------------------------------------------------------------------