Submission to Mid-Cycle Time -1532437667 Assigned ID: 1270 ----- Attempting Submission 1 (Mon Feb 01 01:49:35 GMT 2016) ----- HST Phase I Proposal 1270 (RCS0224_v1.pdf.apt) successfully submitted. Receipt: # 1270-1 I have run the Visit Planner and no problems come up. Not clear why this is flagged. 0 ----- Attempting Submission 1 (Thu Apr 14 10:08:16 GMT 2016) ----- Identifying z>12 galaxies with JWST: What sources produce strong UV emission lines? 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. 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. COSMOLOGY 12 false false false false false false SUPPORTED CLUSTER OF GALAXIES GALAXY PAIR GRAVITATIONAL LENS HIGH REDSHIFT CLUSTER YES 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" J2000 J2000 CLUSTER OF GALAXIES GALAXY PAIR GRAVITATIONAL LENS HIGH REDSHIFT CLUSTER J2000 ACS/WFC Imaging No No F814W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W POS-TARG DITHER DITHER 2 6.10486 Perform subpixel dithering, and ensure that there are at least 3 exposures across the ACS/WFC gap. LINE false false 3.08553 2 91.16385 POS-TARG LINE 85.38987 3 true POS-TARG DITHER DITHER 2 5.183 WFC3-IR-DITHER-LINE false true 0.636 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 131.788 4 true /Users/renskesmit/Documents/HST_proposals/MC2016/OP-cache/RCS0224_phaseII_v1-v01.xml The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 14497 :visit-id "02" :proposal-version -1 :trans-version "20160129" :date "14-Apr-2016 10:51:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14497 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14497 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2847 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 /Users/renskesmit/Documents/HST_proposals/MC2016/OP-cache/RCS0224_phaseII_v1-v03.xml The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. 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