0 Assigned ID: 1886 ----- Attempting Submission 1 (Fri Apr 09 12:11:28 GMT 2021) ----- HST Phase I Proposal 1886 successfully submitted. Receipt: # 1886-1 ----- Attempting Submission 2 (Fri Apr 09 12:21:23 GMT 2021) ----- HST Phase I Proposal 1886 successfully submitted. Receipt: # 1886-2 ----- Attempting Submission 3 (Fri Apr 09 15:54:24 GMT 2021) ----- HST Phase I Proposal 1886 successfully submitted. Receipt: # 1886-3 ----- Attempting Submission 4 (Fri Apr 09 15:58:53 GMT 2021) ----- HST Phase I Proposal 1886 successfully submitted. Receipt: # 1886-4 ----- Attempting Submission 5 (Fri Apr 09 21:23:09 GMT 2021) ----- 0 ----- Attempting Submission 1 (Tue Jul 27 10:00:18 GMT 2021) ----- The ionizing output of galaxies undergoing the most extreme feedback Pinning down the processes at work during the last phase-change of our universe - the epoch of reionization, EoR - remains of paramount importance. While enormous progress has been made on many fronts, we still do not know the nature of the population of objects that was responsible. Recent results suggest that the rapid conclusion of the EoR should have been driven by an ensemble of very compact star-forming galaxies. The major missing piece of this puzzle, however, is knowledge of their emergent ionizing luminosity, and how this varies with galaxy type. How Lyman continuum radiation (LyC) escapes from galaxies presents an ongoing challenge that requires empirical confrontation. Recent surveys at low redshift, where the ionizing flux can be measured, have implicated feedback from star-formation in the emission of LyC: winds are likely necessary to clear dense gas from the ISM. However no strong conclusions can currently be drawn, due to a limited dynamic range in existing surveys. Here we propose to test this feedback-based hypothesis by stretching it to its absolute limit along one axis of the parameter space: we will observe the direct LyC output of galaxies undergoing the most extreme feedback. The proposed starbursts have star-formation densities and outflow velocities an order of magnitude higher than any currently surveyed in LyC. We expect that if there is any population that is stripping its own interstellar medium, leaving channels clear for LyC escape, then it is this one. We will use the results of this very efficient program (six galaxies in just 14 orbits) to empirically evaluate the role to similar compact starbursts in cosmic reionization. This program will obtain ultraviolet slitless spectroscopy of galaxies, using the PR130L element in the solar blind channel of ACS. We will also obtain direct imaging of each target using the F125LP filter. The sample comprises six extremely compact star-forming galaxies with redshifts between 0.4 and 0.75. The targets will be observed for between 1 and 5 orbits each, depending upon brightness. The strategy within an orbit therefore depends upon the number of orbits, and breaks down as follows: - For targets requiring one orbit, the PR130L observation is split into two exposures in the middle of the orbit, and dithered using (small) POS-TARGs for PSF recovery. Direct images are taken before the first spectrum and after the second. - For targets requiring two orbits, the same splitting is used but the PR130L spectra are almost a whole orbit in length; the second spectrum (and direct image) is taken during the second orbit. - For targets requiring more than two orbits we do the same as above. However these observations are split into visits of 2-orbit length, in order to minimize the influence of dark current; this increases rapidly with temperature (time since observations begin), and becomes detrimental after two orbits. The six targets are labelled 1-6 in APT. Visit numbers begin with the corresponding numbers. E.g. 11 is the single visit to observe target #1. Visits 51,52,53 are the three split visits to observe target #5. Our team comprises many experts in the astrophysics of starburst galaxies, with focus on the emission of ionizing radiation: Borthakur discovered the first low-z LyC emitters with HST/COS: Jaskot leads the Low-redshift Lyman continuum Survey, with the first two papers in preparation by Flury, Heckman & Thuan led similar campaigns with COS. Numerous other authors have led other HST studies on LyC emission (Chisholm, Ferguson, Giavalisco, Hayes, Heckman, Henry, Ravindranath, Scarlata, Schaerer, Thuan), who in have all made major contributions across the fields of LyC emission and galaxy winds. Specifically for these data, our team comprises experts in Solar Blind Channel data, including Hayes & Ostlin (who led the Lyman alpha Reference Sample, LARS), Rutkowski, Scarlata (who has also focused upon slitless prism spectroscopy). Between us we have produced a wide array of custom data analysis tools for SBC. On the theoretical side, our team includes leading theoreticians (Trebitsch, Verhamme) who will provide additional input on the interpretation and comparison with hydrodynamical models. Galaxies 6 false false true false false false false SUPPORTED GALAXY STARBURST J2000 J2000 FUV=21.9 (AB) GALAXY STARBURST J2000 J2000 FUV=22.6 (AB) GALAXY STARBURST J2000 J2000 FUV=21.0 (AB) GALAXY STARBURST J2000 J2000 FUV=21.7 (AB) GALAXY STARBURST J2000 J2000 FUV=21.6 (AB) GALAXY STARBURST J2000 J2000 FUV=21.0 (AB) ACS/SBC Spectroscopic No No PR130L ACS/SBC Spectroscopic No No PR130L ACS/SBC Spectroscopic No No PR130L ACS/SBC Spectroscopic No No PR130L ACS/SBC Spectroscopic No No PR130L ACS/SBC Spectroscopic No No PR130L The scheduling data was generated by CASM 29.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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CASM was run in Phase II mode. 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