Final Chance to Map the Spatial Distributions of Lyman-Continuum and Lyman-Alpha Emission of Strong Lyman Continuum Emitters

0 Assigned ID: 6561 ----- Attempting Submission 1 (Thu Apr 10 17:49:48 GMT 2025) ----- POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. Phase2 submitted. 375079964 ----- Attempting Submission 1 (Thu Aug 14 10:04:47 GMT 2025) ----- NA. Final Chance to Map the Spatial Distributions of Lyman-Continuum and Lyman-Alpha Emission of Strong Lyman Continuum Emitters We request high-resolution (~0.1") narrow-band Lyman-alpha (LyA) imaging with HST/ACS ramp filters for a sample of nine strong Lyman continuum Emitters (LCEs, fesc[LyC] > 40% - 80%). A pilot study on the UV-brightest galaxy and strongest leaker known (fesc[LyC] ~ 90%), J1316+2614 at z~3.6, revealed an extended filamentary Lyman-alpha emission around -and a hole on top of- the extremely compact stellar core. We now propose LyA imaging of all other known z ~ 2-3 LCEs with fesc[LyC] > 40%, including seven UV-luminous galaxies and two strongly lensed systems, all with existing high-resolution LyC detections and rest-frame optical nebular emission line maps (JWST/NIRSpec IFU). These observations will enable high-SNR, spatially resolved studies of LyA and LyC emission in and around the stellar cores of faint to extremely UV-luminous leakers (-18 < MUV < -24). In addition, the proposed data will allow us to search for extended filamentary LyA structures- potential gas inflows fueling these powerful starbursts. Combined with existing LyC imaging (HST) and ultra-deep JWST spectroscopic maps (e.g., Halpha, Hbeta, [O III]/[O II], dust maps, etc.), the proposed LyA data will offer the most comprehensive spatial view to date of extreme LyC escape mechanisms, potentially uncovering a new mode of star formation and ionizing photon leakage in the early universe. Acquiring these data is time-sensitive, as ACS/WFC (including ramp filters) may no longer be available in future cycles. This program uses ACS/WFC ramp-filters to map the Lyman-alpha emission (lambda_rest=1216 ang.) of nine UV-bright Lyman continuum emitters at z~2.3-3.2, two of them being magnified by gravitational lensing. Depending on the redshift of each source, observations use the following narrow-band filters: FR388N (z~2.3), FR423N (z~2.4) , and FR505N (z~3.2). Observations use a dither-line pattern with 6 points for cosmic rays removal. A post-flash between 7e- and 12e- (depending on each source/observation) is requiered to reach the threshold of 30e- to avoid poor charge transfer efficiency. PI Rui Marques-Chaves has experience in rest-frame UV/optical spectroscopy and Lyman-continuum and Lyman-alpha emitters. He is also the PI of other ancillary programs related to this sample, including JWST NIRSpec/IFU (GO4), ALMA, HST, and VLT XShooter. Co-PI Anne Verhamme is expert in radiative transfer modelling and spectral diagnostics of LyC leakage. 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-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 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 Prof. Naveen Reddy has experience in rest-frame UV/optical spectroscopy, Lyman-continuum and Lyman-alpha emitters. 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