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The NuSTAR Extragalactic Surveys: Source catalog and the Compton-thick fraction in the UDS field

The NuSTAR Extragalactic Surveys: Source catalog and the Compton-thick fraction in the UDS field
The NuSTAR Extragalactic Surveys: Source catalog and the Compton-thick fraction in the UDS field

We present the results and the source catalog of the NuSTAR survey in the UKIDSS Ultra Deep Survey (UDS) field, bridging the gap in depth and area between NuSTAR's ECDFS and COSMOS surveys. The survey covers a ∼0.6 deg2 area of the field for a total observing time of ∼1.75 Ms, to a half-area depth of ∼155 ks corrected for vignetting at 3-24 keV, and reaching sensitivity limits at half-area in the full (3-24 keV), soft (3-8 keV), and hard (8-24 keV) bands of 2.2 ×10-14 erg cm-2 s-1, 1.0 ×10-14 erg cm-2 s-1, and 2.7 ×10-14 erg cm-2 s-1, respectively. A total of 67 sources are detected in at least one of the three bands, 56 of which have a robust optical redshift with a median of . Through a broadband (0.5-24 keV) spectral analysis of the whole sample combined with the NuSTAR hardness ratios, we compute the observed Compton-thick (CT; N H > 1024 cm-2) fraction. Taking into account the uncertainties on each N H measurement, the final number of CT sources is 6.8 ±1.2. This corresponds to an observed CT fraction of 11.5% ±2.0%, providing a robust lower limit to the intrinsic fraction of CT active galactic nuclei and placing constraints on cosmic X-ray background synthesis models.

galaxies: active, galaxies: evolution, X-rays: general
0067-0049
Masini, A.
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Civano, F.
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Comastri, A.
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Fornasini, F.
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Ballantyne, D.R.
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Lansbury, G.B.
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Treister, E.
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Alexander, D.M.
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Boorman, P.G.
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Brandt, W.N.
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Farrah, D.
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Gandhi, P.
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Harrison, F.A.
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Hickox, R.C.
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Kocevski, D.D.
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Lanz, L.
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Marchesi, S.
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Puccetti, S.
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Ricci, C.
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Saez, C.
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Stern, D.
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Zappacosta, L.
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Masini, A.
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Civano, F.
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Comastri, A.
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Fornasini, F.
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Ballantyne, D.R.
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Lansbury, G.B.
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Treister, E.
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Alexander, D.M.
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Boorman, P.G.
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Brandt, W.N.
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Farrah, D.
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Gandhi, P.
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Harrison, F.A.
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Hickox, R.C.
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Kocevski, D.D.
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Lanz, L.
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Marchesi, S.
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Puccetti, S.
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Ricci, C.
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Saez, C.
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Stern, D.
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Zappacosta, L.
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Masini, A., Civano, F., Comastri, A., Fornasini, F., Ballantyne, D.R., Lansbury, G.B., Treister, E., Alexander, D.M., Boorman, P.G., Brandt, W.N., Farrah, D., Gandhi, P., Harrison, F.A., Hickox, R.C., Kocevski, D.D., Lanz, L., Marchesi, S., Puccetti, S., Ricci, C., Saez, C., Stern, D. and Zappacosta, L. (2018) The NuSTAR Extragalactic Surveys: Source catalog and the Compton-thick fraction in the UDS field. The Astrophysical Journal Supplement Series, 235 (1), [17]. (doi:10.3847/1538-4365/aaa83d).

Record type: Article

Abstract

We present the results and the source catalog of the NuSTAR survey in the UKIDSS Ultra Deep Survey (UDS) field, bridging the gap in depth and area between NuSTAR's ECDFS and COSMOS surveys. The survey covers a ∼0.6 deg2 area of the field for a total observing time of ∼1.75 Ms, to a half-area depth of ∼155 ks corrected for vignetting at 3-24 keV, and reaching sensitivity limits at half-area in the full (3-24 keV), soft (3-8 keV), and hard (8-24 keV) bands of 2.2 ×10-14 erg cm-2 s-1, 1.0 ×10-14 erg cm-2 s-1, and 2.7 ×10-14 erg cm-2 s-1, respectively. A total of 67 sources are detected in at least one of the three bands, 56 of which have a robust optical redshift with a median of . Through a broadband (0.5-24 keV) spectral analysis of the whole sample combined with the NuSTAR hardness ratios, we compute the observed Compton-thick (CT; N H > 1024 cm-2) fraction. Taking into account the uncertainties on each N H measurement, the final number of CT sources is 6.8 ±1.2. This corresponds to an observed CT fraction of 11.5% ±2.0%, providing a robust lower limit to the intrinsic fraction of CT active galactic nuclei and placing constraints on cosmic X-ray background synthesis models.

Text
THE NUSTAR EXTRAGALACTIC SURVEYS: SOURCE CATALOG AND THE - Accepted Manuscript
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Accepted/In Press date: 4 January 2018
e-pub ahead of print date: 8 March 2018
Published date: March 2018
Additional Information: Author Gandhi confirmed Arxiv record 1801.01881v1 is AM
Keywords: galaxies: active, galaxies: evolution, X-rays: general

Identifiers

Local EPrints ID: 420059
URI: http://eprints.soton.ac.uk/id/eprint/420059
ISSN: 0067-0049
PURE UUID: f7a147de-763f-4bc7-93b0-a670fc76a62e
ORCID for P.G. Boorman: ORCID iD orcid.org/0000-0001-9379-4716
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 25 Apr 2018 16:31
Last modified: 17 Dec 2019 05:30

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Contributors

Author: A. Masini
Author: F. Civano
Author: A. Comastri
Author: F. Fornasini
Author: D.R. Ballantyne
Author: G.B. Lansbury
Author: E. Treister
Author: D.M. Alexander
Author: P.G. Boorman ORCID iD
Author: W.N. Brandt
Author: D. Farrah
Author: P. Gandhi ORCID iD
Author: F.A. Harrison
Author: R.C. Hickox
Author: D.D. Kocevski
Author: L. Lanz
Author: S. Marchesi
Author: S. Puccetti
Author: C. Ricci
Author: C. Saez
Author: D. Stern
Author: L. Zappacosta

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