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We present initial results and the source catalog from the NuSTAR survey ofthe Extended Chandra Deep Field South (hereafter, ECDFS) - currently thedeepest contiguous component of the NuSTAR extragalactic survey program. Thesurvey covers the full ~30 arcmin x 30 arcmin area of this field to a maximumdepth of ~360 ks (~220 ks when corrected for vignetting at 3-24 keV), reachingsensitivity limits of ~1.3 x 10^-14 erg/cm2/s (3-8 keV), ~3.4 x 10^-14erg/cm2/s (8-24 keV) and ~3.0 x 10^-14 erg/cm2/s (3-24 keV). Fifty four (54)sources are detected over the full field, although five of these are found tolie below our significance threshold once contaminating flux from neighboring(i.e., blended) sources is taken into account. Of the remaining 49 that aresignificant, 19 are detected in the 8-24 keV band. The 8-24 keV to 3-8 keV bandratios of the twelve sources that are detected in both bands span the range0.39-1.7, corresponding to a photon index range of Gamma ~ 0.5-2.3, with amedian photon index of 1.70 +/- 0.52. The redshifts of the 49 sources in ourmain sample span the range z = 0.21-2.7, and their rest-frame 10-40 keVluminosities (derived from the observed 8-24 keV fluxes) span the range L(10-40keV) ~ (0.7-300) x 10^43 erg/s, sampling below the "knee" of the X-rayluminosity function out to z ~ 0.8-1. Finally, we identify one NuSTAR sourcethat has neither a Chandra nor an XMM-Newton counterpart, but that showsevidence of nuclear activity at infrared wavelengths, and thus may represent agenuine, new X-ray source detected by NuSTAR in the ECDFS.

The NuSTAR Extragalactic Surveys: Initial Results and Catalog from the Extended Chandra Deep Field South