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http://hdl.handle.net/20.500.12386/34386
Titolo: | The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field | Autori: | Zhao, X. Civano, F. Fornasini, F. M. Alexander, D. M. Cappelluti, N. Chen, C. T. Cohen, S. H. Elvis, M. Gandhi, P. Grogin, N. A. Hickox, R. C. Jansen, R. A. Koekemoer, A. LANZUISI, Giorgio Maksym, W. P. Masini, A. Rosario, D. J. Ward, M. J. Willmer, C. N. A. Windhorst, R. A. |
Data pubblicazione: | 2021 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 508 | Fascicolo: | 4 | Da pagina:: | 5176 | Abstract: | We present the NuSTAR extragalactic survey of the James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-Domain Field. The survey covers a ~0.16 deg<SUP>2</SUP> area with a total exposure of 681 ks acquired in a total of nine observations from three epochs. The survey sensitivities at 20 per cent of the area are 2.39, 1.14, 2.76, 1.52, and 5.20 × 10<SUP>-14</SUP> erg cm<SUP>-2</SUP> s<SUP>-1</SUP> in the 3-24, 3-8, 8-24, 8-16, and 16-24 keV bands, respectively. The NEP survey is one of the most sensitive extragalactic surveys with NuSTAR so far. A total of 33 sources were detected above 95 per cent reliability in at least one of the five bands. We present the number counts, logN-logS, measured in the hard X-ray 8-24 and 8-16 keV bands, uniquely accessible by NuSTAR down to such faint fluxes. We performed source detection on the XMM-Newton and Chandra observations of the same field to search for soft X-ray counterparts of each NuSTAR detection. The soft band positions were used to identify optical and infrared associations. We present the X-ray properties (hardness ratio and luminosity) and optical-to-X-ray properties of the detected sources. The measured fraction of candidate Compton-thick (N$\rm _H\ge 10^{24}\, cm^{-2}$) active galactic nuclei, derived from the hardness ratio, is between 3 and 27 per cent. As this survey was designed to have variability as its primary focus, we present preliminary results on multiepoch flux variability in the 3-24 keV band. | URI: | http://hdl.handle.net/20.500.12386/34386 | URL: | https://academic.oup.com/mnras/article/508/4/5176/6382142 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab2885 | Bibcode ADS: | 2021MNRAS.508.5176Z | Fulltext: | open |
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