S22A0001
S22A0001
We propose deep MOSFIRE spectroscopy to confirm redshifts of the most promising candidates of luminous Lyman break galaxies at z>12. These galaxies were found in an H-band dropout selection to search for unprecedentedly high-z objects at z>12 in the 2.3 deg2 near-infrared deep imaging data in the COSMOS and UDS fields, after careful examination of non-detections in the deep optical to J-band images as well as the flat spectrum from K-band to Spitzer IRAC [3.6] and [4.5]-bands. The absolute magnitude of these objects is typically -23.4 mag and the photometric redshifts are estimated to be z>12. An ALMA program targeting one of the candidates shows a 4σ tentative [Oiii]88µm emission line at z=13.27. A successful confirmation of at least one object by rest-UV lines with MOSFIRE will yield the new redshift record far from the current ones at z=9.11 and z=10.96. The proposed MOSFIRE observations are complementary to an approved JWST/NIRSpec PRISM spectroscopy in terms of the wavelength coverage and spectral resolution. These z>12 galaxies are luminous enough to be followed-up with other telescopes and will be the “Rosetta Stones” for galaxy formation studies, once their redshifts are determined.
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