14497( 2) - 14-Apr-2016 14:07:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14497 Version: 2 Check-in Time: 14-Apr-2016 14:07:16 STScI Edit Number: 0 Title Identifying z>12 galaxies with JWST: What sources produce strong UV emission lines? ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Renske Smit Durham Univ. Y CoI: Dr. Mark Swinbank Durham Univ. N CoI: Prof. Jean-Paul Kneib Ecole Polytechnique Federale de Lausanne N CoI: Dr. Richard J. Massey Durham Univ. N CoI: Dr. Johan Richard Centre de Recherche Astrophysique de Lyon N CoI: Prof. Ray M. Sharples Durham Univ. N CoI: Dr. Richard Bower Durham Univ. N CoI: Dr. Ian R. Smail Durham Univ. N ------------------------------------------------------------------------------------ Abstract Since the James Webb Space Telescope (JWST) will effectively operate as a UV telescope for the z>12 Universe, understanding what high-redshift galaxies produce bright UV emission lines is essential in preparing for JWST science on the formation and evolution of the first generations of galaxies. To this end, we propose 3 orbits (1 each of ACS I-, WFC3 J- and H-band) towards the strong lensing cluster RCS 0224-0002 to study the properties of a rare, strongly lensed galaxy at z~5, 300 Myr after the reionisation epoch. Recently, deep MUSE observations have revealed spatially resolved strong CIV 1550A emission within this lensed galaxy, suggesting CIV is produced in low-metallicity nebular regions with ongoing star-formation. Combining these MUSE observations with HST measurements of the brightness and colors of the individual star-forming clumps and the interstellar medium on ~100 pc scales in the source plane of this lensed galaxy will unfold the physical mechanism behind these highly ionised UV emission lines. These insights will enable robust predictions for upcoming JWST observations of similar sources at the cosmic dawn. ------------------------------------------------------------------------------------ Observations Description ------------------------ We aim to observe the core of the strong lensing cluster RCS 0224-0002 with ACS and WFC3/IR imaging. One orbit each is used for F814W, F125W and F160W. We want to split the orbits into 4 individual exposures and apply a dithering pattern for optimal sampling of the PSF. ------------------------------------------------------------------------------------ 14497( 2) - 14-Apr-2016 14:07:16 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 RCS0224-ACS CLUSTER OF GALAXIES, RA=02H24M36.6400S, J2000 Z = 4.88 V = 26 +/- 0.5 GALAXY PAIR, DEC=-00D03'3.06" GRAVITATIONAL LENS, HIGH REDSHIFT CLUSTER Reference Frame: ICRS Extended: YES Comments: We are centering the observations on a high redshift strong lensing cluster at z=0.9, but the main target is a 4 times lensed galaxy at z=5, 14" to the west of the cluster core and extended by 15" ------------------------------------------------------------------------------------------------------------------------------------ 2 RCS0224-WFC3 CLUSTER OF GALAXIES, RA=02H24M34.2550S, J2000 V = 26 GALAXY PAIR, DEC=-00D02'32.39" GRAVITATIONAL LENS, HIGH REDSHIFT CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14497( 2) - 14-Apr-2016 14:07:16 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type LINE LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 6.10486 3.08553 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 91.16385 85.38987 Angle_Between_Sides Center_Pattern NO NO Pattern_Comments: Perform subpixel dithering, and ensure that there are at least 3 exposures across the ACS/WFC gap. ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 131.788 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 14497( 2) - 14-Apr-2016 14:07:16 - [ 4] Visit: 01 Visit Requirements: ORIENT 60D TO 200 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 RCS0224-ACS ACS/WFC ACCUM WFCENTER F814W 1 542 S PATTERN 3 1 (2168 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 | ------------------------------------------------------------------------------------------------------------------------------------ RCS0224-ACS 1 ACS/WFC ACCUM WFCENTER F814W 1 1 none none 1 N/A RCS0224-ACS 1 ACS/WFC ACCUM WFCENTER F814W 1 2 none none 1 N/A RCS0224-ACS 1 ACS/WFC ACCUM WFCENTER F814W 2 1 none none 1 N/A RCS0224-ACS 1 ACS/WFC ACCUM WFCENTER F814W 2 2 none none 1 N/A 14497( 2) - 14-Apr-2016 14:07:16 - [ 5] 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 RCS0224-WFC WFC3/IR MULTIAC IR F125W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 3 CUM (2611.753 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 | ------------------------------------------------------------------------------------------------------------------------------------ RCS0224-WFC3 1 WFC3/IR MULTIAC IR F125W 1 1 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F125W 1 2 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F125W 2 1 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F125W 2 2 none none 1 N/A CUM 14497( 2) - 14-Apr-2016 14:07:16 - [ 6] 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 RCS0224-WFC WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 3 CUM (2611.753 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 | ------------------------------------------------------------------------------------------------------------------------------------ RCS0224-WFC3 1 WFC3/IR MULTIAC IR F160W 1 1 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F160W 1 2 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F160W 2 1 none none 1 N/A CUM RCS0224-WFC3 1 WFC3/IR MULTIAC IR F160W 2 2 none none 1 N/A CUM 14497( 2) - 14-Apr-2016 14:07:16 - [ 7] Summary Form for Proposal 14497 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFCENTER ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 60D TO 200 D, PATTERN 3 1, PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F125W, F160W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names RCS0224-ACS, RCS0224-WFC3 ------------------------------------------------------------------------------------------------------------------------------------