The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field

Journal
Date Issued
2021
Author(s)
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.
•
•
Maksym, W. P.
•
Masini, A.
•
Rosario, D. J.
•
Ward, M. J.
•
Willmer, C. N. A.
•
Windhorst, R. A.
DOI
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 deg2 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 × 10-14 erg cm-2 s-1 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.
Volume
508
Issue
4
Start page
5176
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2021MNRAS.508.5176Z
Rights
open.access
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