0 Assigned ID: 4336 ----- Attempting Submission 1 (Wed May 24 14:06:44 GMT 2023) ----- HST Phase I Proposal 4336 successfully submitted. Receipt: # 4336-1 ----- Attempting Submission 2 (Wed May 24 14:53:04 GMT 2023) ----- HST Phase I Proposal 4336 successfully submitted. Receipt: # 4336-2 ----- Attempting Submission 3 (Wed May 24 18:07:14 GMT 2023) ----- resubmission for HOPR visit Z7 -176191535 ----- Attempting Submission 1 (Wed Sep 13 08:58:39 GMT 2023) ----- ----- Attempting Submission 2 (Wed May 14 08:24:42 GMT 2025) ----- Resubmission -> HOPR Z7 High-resolution imaging of the ionizing and non-ionizing radiation of extreme starbursts at z~2.4 We used to think that cosmic reionization was likely dominated by faint, widely-distributed galaxies until recent results have shown that UV-bright galaxies i) are among the most powerful ionizing sources known, and ii) they appear to be much more numerous than previously thought at the Epoch of Reionization (EoR). These results are enigmatic, however, may completely change our understanding of the nature of very UV-bright galaxies and the potential role these sources play in cosmic reionization. This proposal aims to probe the nature of extremely UV-bright galaxies and the mode of escape of ionizing photons. Here we request high-resolution HST imaging of a representative sample of nine very UV-bright star-forming galaxies at z=2.3-2.5, possibly analogs of EoR bright sources recently uncovered with JWST and HST. These are extremely young (<10Myr), powerful, and very efficient starbursts, showing already hint at very high Lyman continuum (LyC) escape from available high-resolution and high S/N continuum spectra covering Ly-alpha to H-alpha. WFC3/UVIS imaging will probe the ionizing (~750A) and non-ionizing (~1600A) radiation at similar spatial scales (down to ~500pc) to test the LyC escape in these exceptional sources, including very efficient modes of production and escape of ionizing photons, and provide the first high-resolution studies of their morphologies. The requested observations will thus uncover some of the most important, but still open questions raised by these UV-bright sources, including those related to their origin and nature, and their potential role in cosmic reionization. This program uses two sets of filters to obtain the ionizing (LyC) and non-ionizing (UV at ~1600A) emission in nine UV-bright star-forming galaxies at z~2.3-2.4. We use a combination of WFC3/UVIS F225W+F555W and F275W+F606W, depending on the redshift of each source. LyC continuum observations (F225W or F275W) have total exposure times of 3804 sec and 6340 sec (depending on the brightness of each source), i.e., approx. 1.5 and 2.5 orbits, split in 3 and 5 individual exposures, respectively. Observations of the non-ionizing emission (F555W or F606W) have a total exposure time of 1050 sec, split into 3 individual exposures. Observations use a dither-line pattern with 3 or 5 points for cosmic ray removal. Post-flash of 3e- (F606W), 4e- (F555W), 13e- (F225W) and 14-e (F275W) are required to reach a sufficient background level. For all observations, the targets are placed at Aperture='UVIS-C1K1C-CTE'. PI Rui Marques-Chaves has experience in rest-frame UV/optical spectroscopy and Lyman continuum galaxies. He is also the PI of other ancillary programs related to this sample, including ALMA, HST, VLT XShooter/FORS2/HAWK-I, and GTC. Co-I Daniel Schaerer is expert in stellar population modelling, radiation transfer, Lyman continuum galaxies, and multi-wavelength observations and modelling. Co-I Eros Vanzella is the PI of various ground-based and space-based programs targeting high-z galaxies in the lensed fields; expert on morphological analysis, spectral fitting/photometry he is PI of a cycle 1 NIRSpec GO program on high-redshift lensed sources. Co-Is Pascal Oesch and Andrea Weibel are experts in very high redshift galaxies and HST+JWST observations. Co-Is Javier Alvarez-Marquez has expertise in JWST calibration pipeline and data reduction. He is a member of the MIRI european consortium. He has experience on multi-wavelengths imaging analysis with SED-fitting techniques. Co-Is Fabrice Martins, Ankur Upadhyaya, Ana Palacios, and Jonas Guibert have experience in stellar atmospheres and evolutionary models including Very Massive Stars. Co-I Floriane Leclercq is an expert in IFU data analysis specialized in the characterization of high redshift galaxies resolved properties (Leclercq et al. 2017, 2020). Co-I John Chisholm has participated in the TEMPLATES program where the NIRSpec IFU is being used to map the stellar and nebular emission from a set of 4 gravitationally lensed z ~ 2 systems. Chisholm also has detailed experience in NIRSpec reduction and observation planning (JWST/GO: 1871), as well as numerous HST/WFC3 programs. Chisholm also has significant experience with modeling the stelllar continuum features from moderate redshift systems (Chisholm et al. 2019). Co-I Dr. Luis Colina has a large technical experience with infrared HST and JWST imaging and spectroscopy (former HST instrument scientist and present european coPI for MIRI/JWST). He is also an expert on multiwavelength (UV to near-IR) spectroscopy of galaxies to study kinematics, outflows and nature of radiation sources. Co-Is Ismael Perez-Fournon has expertise in graviational lensing and near-IR and sub-mm observations of star-forming galaxies and graviational lensing. Co-I Dr. Dessauges-Zavadsky is an expert in the analysis of small-scale ISM structures of high-redshift galaxies from star-forming clumps to molecular clouds using UV to mm tracers and exploiting strong gravitational lensing. Co-I Uros Mestric has experience in searching for and analysis of high-z Lyman continuum galaxies, and physical and morphological analysis of galaxies in lensed and blank fields. Co-I Anne Verhamme is expert in radiative transfer modelling and spectral diagnostics of LyC leakage. Galaxies 6 false false false false false false SUPPORTED GALAXY STARBURST NO J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 GALAXY STARBURST J2000 J2000 WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F225W WFC3/UVIS Imaging No No F555W POS-TARG DITHER 1.5 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE 1 false POS-TARG DITHER 1.5 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE 3 false POS-TARG DITHER 1.5 LINE false false 5 46.84 WFC3-UVIS-DITHER-LINE 4 false The scheduling data was generated by CASM 31.1. 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