13337( 2) - 24-Jun-2013 18:14:17 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13337 Version: 2 Check-in Time: 24-Jun-2013 18:14:17 STScI Edit Number: 0 Title Resolving the Cluster-Lensed Sextuple Quasar SDSSJ2222+2745 ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Keren Sharon University of Michigan Y CoI: Prof. Michael D. Gladders University of Chicago N CoI: Dr. Haakon Dahle University of Oslo N CoI: Dr. Nicolaas Ervik Groeneboom University of Oslo N CoI: Dr. Matthew Bayliss Harvard University N ------------------------------------------------------------------------------------ Abstract We propose deep multiband imaging of the newly discovered large separation lensed quasar, SDSSJ2222+2745. This system is only the third known of its kind, and uniquely features the largest observed image multiplicity (at least 6), three known images close to the cluster core, and the highest redshift quasar (z=2.8). The cluster also lenses a galaxy at z=2.3 into a giant arc. With the proposed imaging we will precisely measure the three demagnified images of the quasar close to the center of the cluster, detect the 7th image predicted by the lens model, identify additional lensed galaxies, resolve the star formation in the giant arc and the quasar host, measure an upper limit for the mass of the black hole at the centers of the cluster galaxies, and compute a precise and accurate lens model that will form the foundation of many future studies. ------------------------------------------------------------------------------------ Observations Description ------------------------ Total of 5 bands of imaging in 7 orbits - 3 optical filters with ACS (2 orbits each) and two WFC3IR filters in a single orbit. ACS observations programmed as 3 2-orbit visits, with each visit a single filter. A total of 6 frames taken per filter, three per orbit with a gap-crossing dither step between each frame. Target aperture position is WFC1 on the first orbit, and WFC2 in the second orbit, with a slight Y POSTARG. This gives full depth in the center of the field, but maximal field area coverage otherwise. Three frames per orbit gives decent PSF sampling and CR rejection even in regions not only hit in a single orbit. I have slightly adjusted the pattern point spacing from 3.011 arcsec (giving nominally a 61.5 pixel step) to 3.00284 arcsec (giving a nominally 61.33 pixel step and hence yielding a 1/3 pixel grid in three images, of course absent field distortion...). We have restricted the roll angles for the first visit of the ACS images to avoid a brightish (12 mag) star which would otherwise be in the image or at the edge, potentially creating diffratictive/scattered light issues or saturated charge bleeding. Visit 2 and 3 are to be executed at the same angle as visit 1. WFC3-IR images are as per program GO13003. A total of 8 images - 4 per filter with small box dithers for PSF reconstruction. Straight forward. 13337( 2) - 24-Jun-2013 18:14:17 - [ 2] Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13337( 2) - 24-Jun-2013 18:14:17 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ2222+27 CLUSTER OF GALAXIES, RA=22H22M8.5700S, J2000 V = 19.8 +/- 0.05 brightest cluster 45 GRAVITATIONAL LENS DEC=+27D45'34.00" galaxy: sdss i=18.05+/-0.02; QSO: sdss i=20.87+/-0.07 Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13337( 2) - 24-Jun-2013 18:14:17 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.00284 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13337( 2) - 24-Jun-2013 18:14:17 - [ 5] Visit: 01 Visit Requirements: ORIENT 55D TO 120 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 SDSSJ2222+2 ACS/WFC ACCUM WFC1 F435W 1 700 S POS TARG null, -4; 745 see below PATTERN 1 1 (2376 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2222+2 ACS/WFC ACCUM WFC2 F435W 1 700 S POS TARG null, 4; 745 see below PATTERN 1 2 (2568 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F435W 1 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F435W 2 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F435W 3 none none none 1 792.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F435W 1 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F435W 2 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F435W 3 none none none 2 856.0 S 13337( 2) - 24-Jun-2013 18:14:17 - [ 6] Visit: 02 Visit Requirements: SAME ORIENT AS 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 SDSSJ2222+2 ACS/WFC ACCUM WFC1 F606W 1 700 S POS TARG null, -4; 745 see below PATTERN 1 1 (2376 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2222+2 ACS/WFC ACCUM WFC2 F606W 1 700 S POS TARG null, 4; 745 see below PATTERN 1 2 (2568 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F606W 1 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F606W 2 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F606W 3 none none none 1 792.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F606W 1 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F606W 2 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F606W 3 none none none 2 856.0 S 13337( 2) - 24-Jun-2013 18:14:17 - [ 7] Visit: 03 Visit Requirements: SAME ORIENT AS 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 SDSSJ2222+2 ACS/WFC ACCUM WFC1 F814W 1 700 S POS TARG null, -4; 745 see below PATTERN 1 1 (2376 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2222+2 ACS/WFC ACCUM WFC2 F814W 1 700 S POS TARG null, 4; 745 see below PATTERN 1 2 (2568 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F814W 1 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F814W 2 none none none 1 792.0 S SDSSJ2222+2745 1 ACS/WFC ACCUM WFC1 F814W 3 none none none 1 792.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F814W 1 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F814W 2 none none none 2 856.0 S SDSSJ2222+2745 2 ACS/WFC ACCUM WFC2 F814W 3 none none none 2 856.0 S 13337( 2) - 24-Jun-2013 18:14:17 - [ 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 SDSSJ2222+2 WFC3/IR MULTIAC IR-FIX F160W NSAMP=14, SAMP-SEQ=SPARS25 1 DEF POS TARG null, -4; 745 CUM (1311.756 PATTERN 2 1-2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ2222+2 WFC3/IR MULTIAC IR-FIX F110W NSAMP=13, SAMP-SEQ=SPARS25 1 DEF POS TARG null, -4 745 CUM (1211.754 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ2222+2745 1 WFC3/IR MULTIAC IR-FIX F160W 1 none none none 1 N/A CUM SDSSJ2222+2745 1 WFC3/IR MULTIAC IR-FIX F160W 2 none none none 1 N/A CUM SDSSJ2222+2745 1 WFC3/IR MULTIAC IR-FIX F160W 3 none none none 1 N/A CUM SDSSJ2222+2745 1 WFC3/IR MULTIAC IR-FIX F160W 4 none none none 1 N/A CUM SDSSJ2222+2745 2 WFC3/IR MULTIAC IR-FIX F110W 1 none none none 1 N/A CUM SDSSJ2222+2745 2 WFC3/IR MULTIAC IR-FIX F110W 2 none none none 1 N/A CUM SDSSJ2222+2745 2 WFC3/IR MULTIAC IR-FIX F110W 3 none none none 1 N/A CUM SDSSJ2222+2745 2 WFC3/IR MULTIAC IR-FIX F110W 4 none none none 1 N/A CUM 13337( 2) - 24-Jun-2013 18:14:17 - [ 9] Summary Form for Proposal 13337 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-FIX, WFC1, WFC2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=13, NSAMP=14, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 55D TO 120 D, PATTERN 1 1, PATTERN 1 2, PATTERN 2 1-2, POS TARG null, -4, POS TARG null, 4, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F435W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SDSSJ2222+2745 ------------------------------------------------------------------------------------------------------------------------------------