S22B0052
S22B0052
textitThis is a re-submission of the program approved in S20A which was lost due to bad weather and COVID-19. The fraction of LyC photons escaping from galaxies into the surrounding intergalactic medium, fesc, is one of the most important yet poorly constrained physical quantities of star-forming galaxies (SFGs). Direct measurements of fesc for SFGs are still limited, especially for low-mass, low UV luminosity galaxies which are supposed to be primary sources of cosmic reionization at z>6. Here we request FOCAS observations to confirm the Lyα emission line of two candidates of Lyman Continuum Emitters (LCEs) selected with HSC narrow-band imaging observations (the CHORUS project). They are the best z=4.9 LAE candidates whose Lyman continuum (LyC) photons are significantly detected with corresponding narrow-band imaging thanks to the unique wide field-of-view of HSC. Our objectives are (1) to confirm their Lyα emission line, (2) to check the foreground contamination, and (3) spectroscopic confirmation of LyC photons for z=4.9 LCEs, through FOCAS MOS-mode spectroscopy. Our targets will be the highest redshift of direct LyC detections if we confirm their redshifts, being a significant discovery worth publishing in the highest profile journals.
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