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We present the results of a search for high-redshift ($z>9$) galaxycandidates in the JWST UNCOVER survey, using deep NIRCam and NIRISS imaging in7 bands over $\sim45$ arcmin$^2$ and ancillary HST observations. The NIRCamobservations reach a $5-\sigma$ limiting magnitude of $\sim 29.2$ AB. Theidentification of high$-z$ candidates relies on a combination of a dropoutselection and photometric redshifts. We find 16 candidates at $9<z<12$ and 3candidates at $12<z<13$, eight candidates are deemed very robust. Their lensingamplification ranges from $\mu=1.2$ to 11.5. Candidates have a wide range of(lensing-corrected) luminosities and young ages, with low stellar masses($6.8<$ log(M$_{\star}$/M$_{\odot}$) $<9.5$) and low star formation rates(SFR=0.2-7 M$_{\odot}$ yr$^{-1}$), confirming previous findings in early JWSTobservations of $z>9$. A few galaxies at $z\sim9-10$ appear to show a clearBalmer break between the F356W and F444W/F410M bands, which helps constraintheir stellar mass. We estimate blue UV continuum slopes between $\beta=-1.8$and $-2.3$, typical for early galaxies at $z>9$ but not as extreme as thebluest recently discovered sources. We also find evidence for a rapidredshift-evolution of the mass-luminosity relation and a redshift-evolution ofthe UV continuum slope for a given range of intrinsic magnitude, in line withtheoretical predictions. These findings suggest that deeper JWST observationsare needed to reach the fainter galaxy population at those early epochs, andfollow-up spectroscopy will help better constrain the physical properties andstar formation histories of a larger sample of galaxies.

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