15466( 3) - 31-May-2018 11:02:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15466 Version: 3 Check-in Time: 31-May-2018 11:02:26 STScI Edit Number: 0 Title A precise measurement of the mass distribution of the massive cluster lens eMACSJ1341.9-2442 ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Harald Ebeling University of Hawaii Y CoI: Dr. Johan Pierre Richard Centre de Recherche Astrophysique de Lyon N CoI: Mr. Mikkel Stockmann University of Copenhagen, Niels Bohr N Institute CoI: Dr. Sune Toft University of Copenhagen, Niels Bohr N Institute CoI: Dr. Johannes Florian Zabl CNRS - Centre d'Etude Spatiale des N Rayonnements CoI: Prof. Ian Smail Durham Univ. N CoI: Dr. Gabriel Brammer Space Telescope Science Institute - ESA N CoI: Dr. Allison Man European Southern Observatory - Germany N ------------------------------------------------------------------------------------ Abstract We propose multi-band imaging with ACS and WFC3 for a gravitation-lensing measurement of the mass distribution in the core of the massive galaxy cluster eMACSJ1341.9-2442 (z=0.835), responsible for the 30-fold magnification of eMACSJ1341-QG-1 (z=1.59), a recently discovered quiescent galaxy that is representative of ultra-compact early-type galaxies at z~1.5. The goal of the requested observations is to reveal additional strong-lensing features that will allow us to create a robust lens model, thus permitting us to reconstruct the lensed galaxy's intrinsic properties in the source plane as a critical prerequisite for an in-depth, spatially resolved study of the properties and quenching mechanisms governing the evolution of this still poorly understood population of galaxies. As a bonus, the proposed observations will reveal cluster substructure on scales of tens of kpc and hence clues to the merger geometry and formation history of one of the most massive clusters known at z>0.8. ------------------------------------------------------------------------------------ Observations Description ------------------------ Building on the existing WFC3 F110W/F140W SNAPshot images of the core of eMACSJ1341.9-2442, this program will add substantially deeper observations at higher resolution in F606W and F814W (both ACS), as well as additional imaging in F105W and F140W (both WFC3). All observations will use dithering to ensure coverage of chip gaps, as well as efficient removal of artifacts and cosmic rays. To maximize our ability to detect and identify multiple-image families from the matching colors and morphologies of all family members, we devote two orbits 15466( 3) - 31-May-2018 11:02:26 - [ 2] each to observations in ACS/F606W and F814W and (acknowledging the higher throughput of WFC3) a single orbit to imaging with WFC3, split 2:1 between F105W and F140W. The chosen uneven split between the two NIR passbands will result in even 2/3-orbit coverage across both filters, once the existing 1/3 orbit in F140W is added. We minimize time losses incurred by buffer dumps by chosing sufficiently long integration times. For ACS, this means two sets of exposures in a box pattern, resulting in eight integrations for each filter (average exposure time per integration: 560s); for the WFC3 observations we use three sets of exposures along a 2-position line dither for our F105W observation and a single set of exposures in a 3-position line pattern for the F140W observation, each exposure being 278s long. ------------------------------------------------------------------------------------ 15466( 3) - 31-May-2018 11:02:26 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 EMACSJ1341.9 CLUSTER OF GALAXIES, RA=13H42M0.2440S +/- 1", J2000 V = 20 -2442 GRAVITATIONAL LENS DEC=-24D42'0.75" +/- 1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15466( 3) - 31-May-2018 11:02:26 - [ 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 0.262 Line_Spacing 0.192 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 85.29 18.39 Angle_Between_Sides 68.14 Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15466( 3) - 31-May-2018 11:02:26 - [ 5] Visit: 01 Visit Requirements: ORIENT 42D TO 195 D; ORIENT 220D TO 17 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 EMACSJ1341. ACS/WFC ACCUM WFCENTER F606W 1 540 S PATTERN 1 1 9-2442 see below (4568 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 | ------------------------------------------------------------------------------------------------------------------------------------ EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 1 1 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 1 2 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 1 3 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 1 4 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 2 1 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 2 2 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 2 3 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F606W 2 4 none none 2 595.0 S 15466( 3) - 31-May-2018 11:02:26 - [ 6] Visit: 02 Visit Requirements: ORIENT 42D TO 195 D; ORIENT 220D TO 17 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 EMACSJ1341. ACS/WFC ACCUM WFCENTER F814W 1 520 S PATTERN 1 1 9-2442 see below (4568 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 | ------------------------------------------------------------------------------------------------------------------------------------ EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 1 1 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 1 2 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 1 3 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 1 4 none none 1 547.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 2 1 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 2 2 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 2 3 none none 2 595.0 S EMACSJ1341.9-2442 1 ACS/WFC ACCUM WFCENTER F814W 2 4 none none 2 595.0 S 15466( 3) - 31-May-2018 11:02:26 - [ 7] Visit: 03 Visit Requirements: ORIENT 118.5D TO 124.5 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 EMACSJ1341. WFC3/IR MULTIAC IR F140W NSAMP=12, SAMP-SEQ=SPARS25 1 DEF SEQ 1-2 NON-INT; PATTERN 9-2442 CUM (833.814 2 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 EMACSJ1341. WFC3/IR MULTIAC IR F105W NSAMP=12, SAMP-SEQ=SPARS25 3 DEF PATTERN 3 2 9-2442 CUM (1667.628 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 | ------------------------------------------------------------------------------------------------------------------------------------ EMACSJ1341.9-2442 1 WFC3/IR MULTIAC IR F140W 1 none none none 1 N/A CUM EMACSJ1341.9-2442 1 WFC3/IR MULTIAC IR F140W 2 none none none 1 N/A CUM EMACSJ1341.9-2442 1 WFC3/IR MULTIAC IR F140W 3 none none none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 1 none 1 none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 1 none 2 none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 1 none 3 none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 2 none 1 none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 2 none 2 none 1 N/A CUM EMACSJ1341.9-2442 2 WFC3/IR MULTIAC IR F105W 2 none 3 none 1 N/A CUM 15466( 3) - 31-May-2018 11:02:26 - [ 8] Summary Form for Proposal 15466 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 118.5D TO 124.5 D, ORIENT 220D TO 17 D, ORIENT 42D TO 195 D, PATTERN 1 1, PATTERN 2 1, PATTERN 3 2, SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F140W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names EMACSJ1341.9-2442 ------------------------------------------------------------------------------------------------------------------------------------