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We present the results and the source catalog of the NuSTAR survey in theUKIDSS Ultra Deep Survey (UDS) field, bridging the gap in depth and areabetween NuSTAR's ECDFS and COSMOS surveys. The survey covers a $\sim 0.6$deg$^2$ area of the field for a total observing time of $\sim$ 1.75 Ms, to ahalf-area depth of $\sim$ 155 ks corrected for vignetting at $3-24$ keV, andreaching sensitivity limits at half-area in the full ($3-24$ keV), soft ($3-8$keV) and hard ($8-24$ keV) bands of $2.2 \times 10^{-14}$ erg cm$^{-2}$s$^{-1}$, $1.0 \times 10^{-14}$ erg cm$^{-2}$ s$^{-1}$, and $2.7 \times10^{-14}$ erg cm$^{-2}$ s$^{-1}$, respectively. A total of 67 sources aredetected in at least one of the three bands, 56 of which have a robust opticalredshift with a median of $\langle z\rangle \sim 1.1$. Through a broadband($0.5-24$ keV) spectral analysis of the whole sample combined with the NuSTARhardness ratios, we compute the observed Compton-thick (CT; $N_{\rm H} >10^{24}$ cm$^{-2}$) fraction. Taking into account the uncertainties on each$N_{\rm H}$ measurement, the final number of CT sources is $6.8\pm1.2$. Thiscorresponds to an observed CT fraction of $(11.5\pm2.0)\%$, providing a robustlower limit to the intrinsic fraction of CT AGN and placing constraints oncosmic X-ray background synthesis models.

The NuSTAR Extragalactic Surveys: source catalog and the Compton-thick fraction in the UDS field