13317( 5) - 28-Aug-2014 23:46:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13317 Version: 5 Check-in Time: 28-Aug-2014 23:46:01 STScI Edit Number: 1 Title Infrared Grism Confirmation of a Strongly Lensed z ~ 11 Candidate: MACS0647-JD ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Dan Coe Space Telescope Science Institute - ESA Y CoI: Dr. Norbert Pirzkal Space Telescope Science Institute N CoI: Dr. Brenda L. Frye University of Arizona N CoI: Dr. Rychard Bouwens Universiteit Leiden N CoI: Dr. Larry Bradley Space Telescope Science Institute N CoI: Dr. Arjen van der Wel Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Leonidas Moustakas Jet Propulsion Laboratory N CoI: Dr. Daniel D. Kelson Carnegie Institution of Washington N CoI: Dr. Megan Donahue Michigan State University N CoI: Dr. Adi Zitrin California Institute of Technology N CoI: Prof. Thomas J. Broadhurst University of the Basque Country N CoI: Dr. John Moustakas Siena College N CoI: Ms. Elizabeth Barker Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract The first galaxies are the frontier of extragalactic astronomy. How and when did they form, and how did they contribute to reionization? Gravitational lensing has enabled efficient discovery of high-redshift galaxies including MACS0647-JD at z ~ 10.8 (420 Myr after the Big Bang), a strong candidate for the most distant galaxy yet known. This discovery by the CLASH Multi-Cycle Treasury program is consistent with expectations extrapolated from lower redshifts (4 < z < 8). The evolving luminosity function fit to these data includes sufficient numbers of faint galaxies at early times to reionize the universe. However, the discovery of MACS0647-JD is in tension with lower number densities of z > 9 candidates identified in deep field observations including the UDF. These field studies suggest z > 9 galaxies were building up in numbers much more rapidly than observed at later times. Confirmation of the z ~ 10.8 candidate is therefore paramount to our understanding of early galaxy evolution and reionization. All three strongly lensed images of MACS0647-JD are significantly detected in two HST filters (F140W and F160W). Lower redshift objects have been ruled out with high confidence, and the redshift is corroborated by our lens modeling. The strong lensing magnification provides us with a rare opportunity to confirm such a high redshift. We propose to do so with ten orbits of WFC3/IR G141 grism observations. Two orbits of F140W imaging are also required for calibration. As the first ever HST IR grism observations of a z < 1 cluster, this program will serve as an important pathfinder for future IR grism observations of lensed fields with HST and with the James Webb Space Telescope. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe MACS0647+7015 for a total of 12 HST orbits (10 orbits G141 13317( 5) - 28-Aug-2014 23:46:01 - [ 2] grism + 2 orbits F140W imaging) at 3 roll angles (U3 = 53, 165, 204 degrees) carefully selected to minimize contamination of the high-redshift candidate spectra. At each of the 3 roll angles, we will observe for 4 orbits. Each of these 4 orbits will be obtained at a different dither position, following the optimal dither pattern described in Brammer12a. Each orbit will begin with a ~5-minute F140W "direct image" prior to the G141 observations. All G141 observations will be NSAMP=15 SPARS100. All F140W observations will be SPARS50. Thus at each roll angle, we'll have time for the following sequences with exposure times given in seconds (and NSAMP x SPARS in parentheses): Orbit 1) (initial guide star acquisition) F140W 353 ( 8 x 50) G141 1403 (15 x 100) G141 1403 (15 x 100) Orbits 2-4) (guide star re-acquisitions) F140W 503 (11 x 50) G141 1403 (15 x 100) G141 1403 (15 x 100) ------------------------------------------------------------------------------------ 13317( 5) - 28-Aug-2014 23:46:01 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 MACS0647+701 CLUSTER OF GALAXIES, RA=06H47M50.2700S +/- 0.1", J2000 V = 15 5 GRAVITATIONAL LENS, DEC=+70D14'55.00" +/- 0.1" HIGH REDSHIFT CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13317( 5) - 28-Aug-2014 23:46:01 - [ 4] Visit: 01 Visit Requirements: SCHED 30%; ORIENT 53D TO 53 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 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0; SEQ 1-2 15 CUM (352.935 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 1 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=11, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424; 15 CUM (502.937 SEQ 3-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 4 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 3 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=11, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212; 15 CUM (502.937 SEQ 5-6 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 6 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 5 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=11, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788; 15 CUM (502.937 SEQ 7-8 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 8 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 7 15 CUM (2805.874 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 1 WFC3/IR MULTIAC GRISM102 F140W none none none none 1 N/A CUM 4 MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 1 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 1 N/A CUM 4 MACS0647+7015 3 WFC3/IR MULTIAC GRISM102 F140W none none none none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 2 N/A CUM 4 MACS0647+7015 5 WFC3/IR MULTIAC GRISM102 F140W none none none none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 3 N/A CUM 4 MACS0647+7015 7 WFC3/IR MULTIAC GRISM102 F140W none none none none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 4 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 6] Visit: 04 Visit Requirements: SCHED 30%; ORIENT 289D TO 289 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 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0; SEQ 1-2 15 CUM (352.935 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 1 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424; 15 CUM (452.936 SEQ 3-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 4 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 3 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212; 15 CUM (452.936 SEQ 5-6 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 6 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 5 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788; 15 CUM (452.936 SEQ 7-8 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 8 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 7 15 CUM (2805.874 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 1 WFC3/IR MULTIAC GRISM102 F140W none none none none 1 N/A CUM 4 MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 1 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 1 N/A CUM 4 MACS0647+7015 3 WFC3/IR MULTIAC GRISM102 F140W none none none none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 2 N/A CUM 4 MACS0647+7015 5 WFC3/IR MULTIAC GRISM102 F140W none none none none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 3 N/A CUM 4 MACS0647+7015 7 WFC3/IR MULTIAC GRISM102 F140W none none none none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 4 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 8] Visit: 05 Visit Requirements: SCHED 30%; ORIENT 109D TO 109 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 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF POS TARG 0, 0; SEQ 1-2 15 CUM (352.935 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 1 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG 1.355, 0.424; 15 CUM (452.936 SEQ 3-4 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 4 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 3 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG 0.881, 1.212; 15 CUM (452.936 SEQ 5-6 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 6 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 5 15 CUM (2805.874 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 MACS0647+70 WFC3/IR MULTIAC GRISM1024 F140W NSAMP=10, SAMP-SEQ=SPARS50 1 DEF POS TARG -0.474, 0.788; 15 CUM (452.936 SEQ 7-8 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 8 MACS0647+70 WFC3/IR MULTIAC GRISM1024 G141 NSAMP=15, SAMP-SEQ=SPARS100 2 DEF SAME POS AS 7 15 CUM (2805.874 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 1 WFC3/IR MULTIAC GRISM102 F140W none none none none 1 N/A CUM 4 MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 1 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ MACS0647+7015 2 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 1 N/A CUM 4 MACS0647+7015 3 WFC3/IR MULTIAC GRISM102 F140W none none none none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 2 N/A CUM 4 MACS0647+7015 4 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 2 N/A CUM 4 MACS0647+7015 5 WFC3/IR MULTIAC GRISM102 F140W none none none none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 3 N/A CUM 4 MACS0647+7015 6 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 3 N/A CUM 4 MACS0647+7015 7 WFC3/IR MULTIAC GRISM102 F140W none none none none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 1 none 4 N/A CUM 4 MACS0647+7015 8 WFC3/IR MULTIAC GRISM102 G141 none none 2 none 4 N/A CUM 4 13317( 5) - 28-Aug-2014 23:46:01 - [ 10] Summary Form for Proposal 13317 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM1024 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, NSAMP=11, NSAMP=15, NSAMP=8, SAMP-SEQ=SPARS100, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 109D TO 109 D, ORIENT 289D TO 289 D, ORIENT 53D TO 53 D, POS TARG -0.474, 0.788, POS TARG 0, 0, POS TARG 0.881, 1.212, POS TARG 1.355, 0.424, SAME POS AS 1, SAME POS AS 3, SAME POS AS 5, SAME POS AS 7, SCHED 30%, SEQ 1-2 NON-INT, SEQ 3-4 NON-INT, SEQ 5-6 NON-INT, SEQ 7-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names MACS0647+7015 ------------------------------------------------------------------------------------------------------------------------------------