0 Assigned ID: 1533 ----- Attempting Submission 1 (Fri Sep 29 16:43:44 GMT 2017) ----- HST Phase I Proposal 1533 (A521.apt) successfully submitted. Receipt: # 1533-1 ----- Attempting Submission 2 (Sat Sep 30 07:53:13 GMT 2017) ----- changed orient ranges to those suggested by CS to avoid nearby bright sources changed to 110 - 130 orient range to keep plan windows -519106792 ----- Attempting Submission 1 (Mon Dec 04 21:49:41 GMT 2017) ----- ----- Attempting Submission 2 (Tue Dec 05 14:03:07 GMT 2017) ----- ----- Attempting Submission 3 (Thu Jan 18 13:29:28 GMT 2018) ----- ----- Attempting Submission 4 (Thu Jan 18 21:37:53 GMT 2018) ----- The sub-kiloparsec comparison of stellar clumps and molecular gas within the spiral arms of a high-redshift galaxy Unlike local spiral galaxies, high-redshift galaxies typically have extremely clumpy morphologies. Recent simulations suggest that this clumpy morphology arises because extreme inflows of cool gas create gravitational instabilities that fragment the gaseous disk. High sensitivity and spatial resolution observations comparing individual stellar and gaseous clumps are required to provide the irrefutable evidence that fragmentation actually leads to the observed clumpy morphologies. Here we propose HST/WFC3 mid-cycle observations in three bands (F390W, F105W, F160W) of a highly magnified and spatially stretched galaxy at z = 1, where we can study gas and stars at 100 pc resolutions. These observations require a total of 4 orbits. We need mid-cycle observations because we received exceptional ALMA CO(4-3) emission maps in April 2017. Amazingly, these ALMA observations show CO(4-3) emission along the spiral arms of the galaxy. This is the first time that molecular gas has been observed along spiral arms at high redshifts. With the new HST/WFC3 observations we will identify individual stellar clumps, and model their spectral energy distributions to determine their stellar masses, extinction corrected star formation rates, densities and ages. For the first time at z = 1, we will use these observations to establish the evolutionary sequence of stellar clumps, to test the redshift evolution of the Kennicutt-Schmidt law at sub-kpc scales, and to constrain the lifetimes of molecular clouds. This will be the first sub-kpc comparison of individual molecular and stellar clumps within the spiral arms of a high-redshift galaxy. Here, we make observations of the lensed z ~ 1 galaxy Abell0521. We observe the cluster in three HST/WFC3 filters to measure the star formation rate (F390W), stellar age (F105W), and stellar mass (F160W). We center the image at the same position as previous HST/WFPC2 F606W images (PID: 11312). We also use the same orientation constraints (between 270-310 degrees) but include the opposite of the constraints to increase schedulability (90-130 degrees). The opposite orientation would flip the image, but preserve the orientation of the F606W image. We use a four position dither script. We use one orbit for the F390W and F105W images and two orbits for the F160W images. We use a post-exposure flash for the F390W images. Galaxies and the IGM 6 false false false false false false SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS YES J2000 J2000 WFC3/IR Imaging No No F105W WFC3/UVIS Imaging No No F390W WFC3/IR Imaging No No F160W POS-TARG DITHER 1.716 We increased the size of the default dither pattern to keep the sub-pixel dithering LINE 1.095 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false POS-TARG DITHER 0.519 We increased the size of the default dither pattern to keep the sub-pixel dithering LINE 0.336 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 2 false The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15435 :visit-id "02" :proposal-version -1 :trans-version "20171009" :date "30-Nov-2017 12:00:01.0" :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 15435 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15435 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2844 :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 3209 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15435 :visit-id "03" :proposal-version -1 :trans-version "20171009" :date "30-Nov-2017 12:00:31.0" :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 15435 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15435 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2844 :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 3209 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15435 :visit-id "04" :proposal-version -1 :trans-version "20171009" :date "30-Nov-2017 12:00:03.0" :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 15435 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15435 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2844 :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 3209 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15435 :visit-id "05" :proposal-version -1 :trans-version "20171009" :date "30-Nov-2017 12:00:03.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15435 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15435 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2875 :al-overhead-at-end 121 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3209 :pcs-gap 0 ) false 1 0