The NuSTAR Extragalactic Surveys: Overview and Catalog from the COSMOS Field
F. Civano, R. C. Hickox, S. Puccetti, A. Comastri, J. R. Mullaney, L., Zappacosta, S. M. LaMassa, J. Aird, D. M. Alexander, D. R. Ballantyne, F. E., Bauer, W. N. Brandt, S. E. Boggs, F. E. Christensen, W. W. Craig, A., Del-Moro, M. Elvis, K. Forster, P. Gandhi

TL;DR
This paper presents the NuSTAR survey of the COSMOS field, providing a catalog of 91 X-ray sources, including heavily obscured AGN, and introduces a new detection strategy to improve sensitivity in high-energy X-ray observations.
Contribution
The study offers the first comprehensive NuSTAR catalog for the COSMOS field, with a novel detection method and detailed analysis of source properties, especially identifying Compton-thick AGN.
Findings
Detected 91 NuSTAR sources with luminosities 10^42-10^45.5 erg/s.
Identified 13-20% candidate Compton-thick AGN based on hardness ratios.
Discovered a highly obscured, previously unrecognized Compton-thick AGN.
Abstract
To provide the census of the sources contributing to the X-ray background peak above 10 keV, NuSTAR is performing extragalactic surveys using a three-tier "wedding cake" approach. We present the NuSTAR survey of the COSMOS field, the medium sensitivity and medium area tier, covering 1.7 deg2 and overlapping with both Chandra and XMM-Newton data. This survey consists of 121 observations for a total exposure of ~3 Ms. To fully exploit these data, we developed a new detection strategy, carefully tested through extensive simulations. The survey sensitivity at 20% completeness is 5.9, 2.9 and 6.4 x 10^-14 erg/cm2/s in the 3-24 keV, 3-8 keV and 8-24 keV bands, respectively. By combining detections in 3 bands, we have a sample of 91 NuSTAR sources with 10^42 -10^45.5 erg/s luminosities and redshift z=0.04-2.5. Thirty two sources are detected in the 8-24 keV band with fluxes ~100 times fainter…
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