We report the discovery of four galaxy candidates observed 450–600 Myr after the Big Bang with photometric redshifts between
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Abstract z ∼ 8.3 and 10.2 measured using James Webb Space Telescope (JWST) NIRCam imaging of the galaxy cluster WHL0137−08 observed in eight filters spanning 0.8–5.0μ m, plus nine Hubble Space Telescope filters spanning 0.4–1.7μ m. One candidate is gravitationally lensed with a magnification ofμ ∼ 8, while the other three are located in a nearby NIRCam module with expected magnifications ofμ ≲ 1.1. Using SED fitting, we estimate the stellar masses of these galaxies are typically in the range = 8.3–8.7. All appear young, with mass-weighted ages <240 Myr, low dust contentA V < 0.15 mag, and specific star formation rates sSFR ∼0.25–10 Gyr−1for most. Onez ∼ 9 candidate is consistent with an age <5 Myr and an sSFR ∼10 Gyr−1, as inferred from a strong F444W excess, implying [Oiii ]+Hβ rest-frame equivalent width ∼2000 Å, although an olderz ∼ 10 object is also allowed. Anotherz ∼ 9 candidate is lensed into an arc 2.″4 long with a magnification ofμ ∼ 8. This arc is the most spatially resolved galaxy atz ∼ 9 known to date, revealing structures ∼30 pc across. Follow-up spectroscopy of WHL0137−08 with JWST/NIRSpec will be useful to spectroscopically confirm these high-redshift galaxy candidates and to study their physical properties in more detail.