JWST UNCOVER: Discovery of $z>9$ Galaxy Candidates Behind the Lensing Cluster Abell 2744

Understand

We present the results of a search for high-redshift ($z>9$) galaxy candidates in the JWST UNCOVER survey, using deep NIRCam and NIRISS imaging in 7 bands over $\sim45$ arcmin$^2$ and ancillary HST observations.

• The NIRCam observations reach a $5-\sigma$ limiting magnitude of $\sim 29.2$ AB.
• The identification of high$-z$ candidates relies on a combination of a dropout selection and photometric redshifts.
• We find 16 candidates at $9<z<12$ and 3 candidates at $12<z<13$, eight candidates are deemed very robust.