Submission Friday 6:06pm. minor changes to PDF 2002408783 Assigned ID: 1614 ----- Attempting Submission 1 (Thu Apr 08 12:43:14 GMT 2021) ----- HST Phase I Proposal 1614 successfully submitted. Receipt: # 1614-1 ----- Attempting Submission 2 (Fri Apr 09 19:20:06 GMT 2021) ----- HST Phase I Proposal 1614 successfully submitted. Receipt: # 1614-2 ----- Attempting Submission 3 (Fri Apr 09 22:06:45 GMT 2021) ----- FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser Hi Tricia and Debopam, As per our email coversation 16--22 Dec 2021, I'm resubmititng the Phase 2 to split the observations evenly into 2 different ORIENT roll angles. I'm going with "method B", where I've split the 10 orbits into 4 visits, at depths of 2, 3, 2, and 3 orbits. The first 2 visits are at ORIENT A and the second 2 visits are at ORIENT B. This has the advantage of same depth for each roll, which should make the reduction easier. The hit to efficiency is modest, and we think this strategy makes our program more robust to contamination from cluster galaxies. -1230142344 ----- Attempting Submission 1 (Tue Jul 27 00:43:21 GMT 2021) ----- ----- Attempting Submission 2 (Wed Jan 05 21:17:17 GMT 2022) ----- Email from our contact scientist, July 12, told us to expect this error about the UVIS background level. Mapping the escape of Ly alpha and ionizing photons from an extreme emission-line lensed galaxy We propose 10 orbits of HST WFC3-UVIS G280 slitless grism spectroscopy of S1723, an extremely bright gravitationally lensed galaxy at redshift z=1.3293. The proposed observations will spatially map Lyman alpha, escaping ionizing radiation, and the non-ionizing UV spectral slope, on spatial scales never before obtained for an extreme emission line galaxy. Combining this new spectrum with a published HST-WFC3 G141 grism of Ha will produce maps of Lya escape fraction and ionizing photon escape fraction, to reveal how Lyman alpha and ionizing photons are able to escape. This target has the extremely strong rest-frame UV and optical emission lines that are a hallmark of galaxies at the epoch of reionization (z~7--8), but due to lensing magnification, can be studied at very high spatial resolution. The target has a wealth of published data including HST multiband imaging, a lens model, and MMT, Keck, Gemini, and HST spectra, and is an approved target for JWST imaging and spectroscopy with NIRCam, NIRSpec, and MIRI, with all data to go public as they are observed. This is 10 orbits of WFC3/UVIS grism spectroscopy, using the G280 grism, with just enough direct imaging in F300X to do the wavelength calibration. We adapted the observing strategy from the similar program GO 15966. We split the 10 orbits into 3 visits (3 orbits, 3 orbits, 4 orbits) to improve schedulability. As noted in Phase 1, we request an ORIENT special requirement to avoid bright contaminating sources, especially the brightest cluster galaxy, and to place the arc as perpedicular as possible to the dispersion direction (to minimize the extent to which the arc contaminates itself). We find that there is one unique ORIENT, as well as its +180 degree sister, that satisfies these contamination issues. We chose this ORIENT using Aladin. As suggested by our Instrument Scientist, we use a postflash to set a minimum UVIS image total background of ~20 electrons/pix (actually 19.9). The team has extensive experience constructing lens models, interpreting imaging and spectroscopic datasets of lensed galaxies, and publishing results. PI Rigby is the PI of multiple Hubble programs, and is the PI of the JWST ERS program TEMPLATES, which will obtain MIRI, NIRCam, and NIRSpec imaging and spectroscopic data on S1723, the target of this proposal. Co-I Florian and PI Rigby have led two recent studies on the target of this proposal: Florian et al. 2021, ApJ in press, and Rigby et al. 2021, ApJ, 908, 154. Co-Is Sharon and Mahler are world-recognized experts at lens modeling. Sharon published the lens model for this target in the omnibus paper Sharon et al. 2020, ApJS, 247, 12. Co-Is Rivera-Thorsen, Mainali, Chisholm, Kim, and Bayliss have published multiple recent papers regarding extreme star-forming galaxies, including those that leak ionizing radiation. Co-Is Berg and Florian and PI Rigby have experience reducing WFC3 grism data like that proposed here. Co-I Gladders has led surveys to systematically discover large samples of gravitationally lensed galaxies, which include the target of this proposal. Galaxies 0 false false true false true false false false SUPPORTED GALAXY EMISSION LINE NEBULA GRAVITATIONAL LENS HIGH REDSHIFT GALAXY STAR FORMING REGION J2000 J2000 From Florian et al. 2021: m_(1.6um)=20.1, m(1.4um)=20.2, m(1.1um)=20.2, m(1.05um)=19.9, m(0.775um)=20.5, m(0.390um)=20.6. All AB mags WFC3/UVIS Spectroscopic No No G280 The scheduling data was generated by CASM 29.2. 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