0 Assigned ID: 3176 ----- Attempting Submission 1 (Fri Mar 25 09:58:19 GMT 2022) ----- HST Phase I Proposal 3176 successfully submitted. Receipt: # 3176-1 ----- Attempting Submission 2 (Fri Mar 25 13:19:18 GMT 2022) ----- Removed complexity with POS-TARG and scheduling. -832032028 ----- Attempting Submission 1 (Fri Jul 08 17:59:06 GMT 2022) ----- HST Phase II Proposal 17133 successfully submitted. Receipt: # 17133-1 ----- Attempting Submission 2 (Fri Jul 08 19:11:36 GMT 2022) ----- We propose multi-band WFC3 imaging of the ionizing radiation and non-ionizing continuum (F390W, F814W, and F140W) from the most distant and strongest Lyman continuum (LyC) emitting galaxy at z=4, dubbed Ion3. Available VLT/FORS2 and X-Shooter spectra reveal a strong LyC emission from 912 Ang down to 750 Ang, as well as a multiple-peaked Lya profile. Unfortunately, no information on the sub-kpc morphology of Ion3 exist at any wavelengths. This information is vital to constrain the detailed mechanisms that regulate the emission of LyC radiation from star-forming galaxies, especially at 3<z<4, the highest redshift likely to yield direct observations of LyC and the closest to the Epoch of Reionization. With this program we will map the morphology and extent of the LyC and non-ionizing radiation (NUV and FUV) that emerge from Ion3. The HST imaging is essential to (1) investigate the size and light profile of the LyC emission, locate its centroid and study if it is co-spatial or off-centered with respect to the FUV and NUV emission; (2) measure the Balmer break, providing us with age estimates and insight into underlying old stellar population. The HST multi-band imaging will enable us to understand the physical properties of Ion3 and to compare it with those from other detected LyC emitters at high and lower redshift. This will provide the unique opportunity to unveil the mechanisms that regulate the escape of ionizing photons from the LyC galaxy that is the closest in time to those at the EoR. This program images a Lyman continuum emitter at z~4 with the F390W, F814W, and F140W filters to obtain rest-frame FUV through NUV imaging data. Full orbit integrations are obtained for F390W in order to minimize post-flash and read-noise and maximize the total depth. We break up F390W observations into three visits of 3 orbits to aid in scheduling, but emaphsize the necessity of having 3 exposures per visit to be able to sufficiently clean cosmic rays for alignment and combining all 9 exposures. F390W do not require post-flash to reach sufficient background per pixel, but F814W requires 3e- due to 4 exposures in the 1 orbit to obtain a very clean image. The target is placed at the CTE optimized location (near readout on Chip C) via the CTE aperture for F390W and F814W. For F140W we keep the target in the center. Given the possiple orientations of the WFC3/UVIS observations, the fraction of overlap of the WFC3/UVIS and WFC3/IR could vary a lot. We add an additional POSTARG to the WFC3/IR observations to overlap the WFC3/UVIS and WFC3/IR data and avoid the bright star. Lastly, we allow the ORIENT for the F814W and F140W visits to vary by +-5 degrees to ensure overlap but aid in scheduling of the observations. Each filter utilizes a different dither pattern. The two WFC3/UVIS visits use a larger than default pattern to help minimize the blotchy pattern observed in F336W imaging (i.e., similar to that seen in Rafelski et al. 2015, AJ, 150 31, Figure 15) and to dither over the chip gap. For F390W, we use three 3-point dither patterns with each visit offset from the other two by 3" in both x and y. The 3 point dither pattern point spacing is increased by a factor of 9. For F814W, we use the standard 4-point box pattern with the point and line spacing multiplied by a factor of 19. We tie the orient of the different visits to each other as stated in the phase I special requirements. We also specify an orient range to avoid placing the bright v_mag=8.5 star on the detector, and try to keep the bright star sufficiently far away from the detector to minimize dragon's breath. Our program is not significantly affected by the possibility of one gyro mode. While we do have an orient constraint, we could place the target on a different part of the detector if necessary to support a different orient while avoiding the bright star. This is not ideal, but would enable more flexibility in one gyro mode. Each team member will provide scientific inputs and/or specific actions depending on their experience/expertise, as grouped below: Experts on HST planing, data reduction and analysis: Dr. M. Rafelski, A. Zanella, A. Mercurio, M. Giavalisco, M. Nonino, P. Rosati Experts on spectroscopic and photometric analysis of faint high-z galaxies and AGNs: Dr. M. Giavalisco, Dr. M. Rafelski, M. Nonino, Dr. R. Gilli, K. Caputi, Dr. A. Comastri, G. Caminha, C. Grillo E. Sani, P. Rosati, M. Castellano, S. Cristiani, G. Cupani, M. Mignoli, U. Mestric, E. Vanzella Experts on high redshift galaxies, galaxy evolution and morphology: Dr. M. Giavalisco, Dr. M. Rafelski, A. Zanella, K. Caputi, A. Mercurio, F. Calura, M. Castellano, P. Rosati, S. Cristiani, Z. Ji, M. Meneghetti, E. Vanzella Experts on lensing models and galaxy cluster physics: C. Grillo, G. Caminha, M. Meneghetti, P. Rosati, E. Vanzella Part of the team proposed and obtained HST imaging (cycle 23 GO 14088, PI Vanzella) to secure the Lyman continuum from another high-redshift galaxy, dubbed Ion2 (De Barros et al. 2016; Vanzella et al. 2016). The team has all the expertise to successfully carry out the proposed observations, reduce the data, interpret it and publish the results. Galaxies 6 false false false false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY YES J2000 J2000 R-band=23.72+/-0.05; I-band= 23.91+/-0.05 WFC3/UVIS Imaging No No F390W WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F140W POS-TARG DITHER 3.287 Multiplied spacing by 19 to have a wide dither pattern LINE 2.128 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false POS-TARG DITHER 1.215 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 3 false 1657302773329 /Users/mrafelski/Dropbox/work/proposals/HST/cycle30/Ion3/APT_real/OP-cache/ion3-v01.xml Hst Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17133 :visit-id "01" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 13:52:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 866240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17133 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17133 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "01" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 3 0 1657302588109 /Users/mrafelski/Dropbox/work/proposals/HST/cycle30/Ion3/APT_real/OP-cache/ion3-v02.xml Hst Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17133 :visit-id "02" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 13:49:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 866240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17133 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17133 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 3 0 1657302588457 /Users/mrafelski/Dropbox/work/proposals/HST/cycle30/Ion3/APT_real/OP-cache/ion3-v03.xml Hst Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17133 :visit-id "03" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 13:49:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 866240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17133 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17133 :visit-id "03" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "03" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17133 :visit-id "03" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2846 :al-overhead-at-end 116 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 3 0 1657307457077 /Users/mrafelski/Dropbox/work/proposals/HST/cycle30/Ion3/APT_real/OP-cache/ion3-v04.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17133 :visit-id "04" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 15:10:56.0" :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 17133 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17133 :visit-id "04" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2852 :al-overhead-at-end 120 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3238 :pcs-gap 0 ) true 1 0 1657307457468 /Users/mrafelski/Dropbox/work/proposals/HST/cycle30/Ion3/APT_real/OP-cache/ion3-v05.xml The scheduling data was generated by CASM 30.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17133 :visit-id "05" :proposal-version -1 :trans-version "20220516" :date "08-Jul-2022 15:10:57.0" :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 17133 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17133 :visit-id "05" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2840 :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 3238 :pcs-gap 0 ) true 1 0