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

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 $\sim 0.6$ deg${}^2$ area of the field for a total observing time of $\sim$ 1.75 Ms, to a half-area depth of $\sim$ 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 $2.2\times 10^{-14}$ erg cm${}^{-2}$ s${}^{-1}$, $1.0\times 10^{-14}$ erg cm${}^{-2}$ s${}^{-1}$, and $2.7\times 10^{-14}$ 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 $⟨z⟩\sim 1.1$. 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; $N_{\mathrm{H}}>10^{24}$ cm${}^{-2}$) fraction. Taking into account the uncertainties on each $N_{\mathrm{H}}$ measurement, the final number of CT sources is $6.8\pm 1.2$. This corresponds to an observed CT fraction of $(11.5\pm 2.0)\%$, providing a robust lower limit to the intrinsic fraction of CT AGN and placing constraints on cosmic X-ray background synthesis models.

23 pages, accepted for publication in The Astrophysical Journal Supplement Series

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Cited by in corpus (23)

• The Accretion History of AGN I: Supermassive Black Hole Population Synthesis Model
• The Chandra COSMOS Legacy Survey: Compton Thick AGN at high redshift
• Long-Exposure NuSTAR Constraints on Decaying Dark Matter in the Galactic Halo
• BASS XXXVII: The role of radiative feedback in the growth and obscuration properties of nearby supermassive black holes
• The properties of the AGN torus as revealed from a set of unbiased NuSTAR observations
• The molecular gas content in obscured AGN at z > 1
• NuSTAR observations of heavily obscured Swift/BAT AGN: constraints on the Compton-thick AGN fraction
• Selection of massive evolved galaxies at $3\le z\le 4.5$ in the CANDELS fields
• A hard look at local, optically-selected, obscured Seyfert galaxies
• A Large Population of Luminous Active Galactic Nuclei Lacking X-ray Detections: Evidence for Heavy Obscuration?
• NuSTAR measurement of the cosmic X-ray background in the 3-20 keV energy band
• AGN X-ray luminosity function and absorption function in the Early Universe ($3\le z\le 6$)
• Accretion History of AGN III: Radiative Efficiency and AGN Contribution to Reionization
• A High Fraction of Heavily X-ray Obscured Active Galactic Nuclei
• The NuSTAR Extragalactic Survey of the James Webb Space Telescope North Ecliptic Pole Time-Domain Field
• PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time-Domain Field II
• Measuring the Cosmic X-ray Background in 3-20keV with Straylight from NuSTAR
• Multi-wavelength Selected Compton-thick AGNs in Chandra Deep Field-South Survey
• The NuSTAR Extragalactic Surveys: unveiling rare, buried AGNs and detecting the contributors to the peak of the Cosmic X-ray Background
• X-ray spectral properties of dust-obscured galaxies in the XMM-SERVS coverage of the XMM-LSS field
• Identifying Compton-thick active galactic nuclei in the COSMOS. II. Searching among mid-infrared selected AGNs
• The $N_H$ Distribution of Hard X-ray Selected AGN in the NEP Field
• The $\text{NuSTAR}$ Extragalactic Surveys: Source Catalogs from the Extended $\text{Chandra}$ Deep Field-South and the $\text{Chandra}$ Deep Field-North