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

The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field
The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field
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 (NH≥1024cm−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.
X-rays: galaxies, galaxies: active, surveys
1365-2966
5176–5195
Gandhi, Poshak
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Zhao, X.
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Civano, F.
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Fornasini, F. M.
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Alexander, D.M.
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Cappelluti, N.
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Chen, C. T.
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Cohen, S. H.
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Elvis, M.
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Grogin, N.A.
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Hickox, R.C.
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Jansen, R. A.
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Koekemoer, Anton M.
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Lanzuisi, G.
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Peter Maksym, W.
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Masini, A.
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Rosario, D.J.
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Ward, M.J.
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Willmer, C. N. A.
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Windhorst, R. A.
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Gandhi, Poshak
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Zhao, X.
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Civano, F.
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Fornasini, F. M.
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Alexander, D.M.
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Cappelluti, N.
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Chen, C. T.
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Cohen, S. H.
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Elvis, M.
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Grogin, N.A.
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Hickox, R.C.
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Jansen, R. A.
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Koekemoer, Anton M.
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Lanzuisi, G.
93c0256d-2ab4-49a4-94e7-872ae54df6c3
Peter Maksym, W.
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Masini, A.
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Rosario, D.J.
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Ward, M.J.
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Willmer, C. N. A.
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Windhorst, R. A.
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Gandhi, Poshak, Zhao, X., Civano, F., Fornasini, F. M., Alexander, D.M., Cappelluti, N., Chen, C. T., Cohen, S. H., Elvis, M., Grogin, N.A., Hickox, R.C., Jansen, R. A., Koekemoer, Anton M., Lanzuisi, G., Peter Maksym, W., Masini, A., Rosario, D.J., Ward, M.J., Willmer, C. N. A. and Windhorst, R. A. (2021) The NuSTAR extragalactic survey of the James Webb Space Telescope North Ecliptic Pole time-domain field. Monthly Notices of the Royal Astronomical Society, 508 (4), 5176–5195. (doi:10.1093/mnras/stab2885).

Record type: Article

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 (NH≥1024cm−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.

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2109.13839 - Accepted Manuscript
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Accepted/In Press date: 28 September 2021
e-pub ahead of print date: 6 October 2021
Published date: 1 December 2021
Additional Information: Publisher Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords: X-rays: galaxies, galaxies: active, surveys

Identifiers

Local EPrints ID: 453220
URI: http://eprints.soton.ac.uk/id/eprint/453220
ISSN: 1365-2966
PURE UUID: a2282585-f788-4b60-a914-a6fa9124bed1
ORCID for Poshak Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 11 Jan 2022 17:39
Last modified: 17 Mar 2024 03:36

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Contributors

Author: Poshak Gandhi ORCID iD
Author: X. Zhao
Author: F. Civano
Author: F. M. Fornasini
Author: D.M. Alexander
Author: N. Cappelluti
Author: C. T. Chen
Author: S. H. Cohen
Author: M. Elvis
Author: N.A. Grogin
Author: R.C. Hickox
Author: R. A. Jansen
Author: Anton M. Koekemoer
Author: G. Lanzuisi
Author: W. Peter Maksym
Author: A. Masini
Author: D.J. Rosario
Author: M.J. Ward
Author: C. N. A. Willmer
Author: R. A. Windhorst

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