X-UDS: The Chandra Legacy Survey of the UKIDSS Ultra Deep Survey Field

Abstract

We present the X-UDS survey, a set of wide and deep Chandra observations of the Subaru-XMM Deep/UKIDSS Ultra Deep Survey (SXDS/UDS) field. The survey consists of 25 observations that cover a total area of 0.33 deg${}^2$. The observations are combined to provide a nominal depth of ~600 ksec in the central 100 arcmin${}^2$ region of the field that has been imaged with Hubble/WFC3 by the CANDELS survey and $\sim$200 ksec in the remainder of the field. In this paper, we outline the survey's scientific goals, describe our observing strategy, and detail our data reduction and point source detection algorithms. Our analysis has resulted in a total of 868 band-merged point sources detected with a false-positive Poisson probability of $<1\times 10^{-4}$. In addition, we present the results of an X-ray spectral analysis and provide best-fitting neutral hydrogen column densities, $N_{\mathrm{H}}$, as well as a sample of 51 Compton-thick active galactic nucleus candidates. Using this sample, we find the intrinsic Compton-thick fraction to be 30-35% over a wide range in redshift ($z=0.1-3$), suggesting the obscured fraction does not evolve very strongly with epoch. However, if we assume that the Compton-thick fraction is dependent on luminosity, as is seen for Compton-thin sources, then our results are consistent with a rise in the obscured fraction out to $z\sim 3$. Finally, an examination of the host morphologies of our Compton-thick candidates shows a high fraction of morphological disturbances, in agreement with our previous results. All data products described in this paper are made available via a public website.

arXiv comment15 pages, 11 figures, published in the Astrophysics Journal Supplement Series

References in corpus (58)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey
• CANDELS: The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey - The Hubble Space Telescope Observations, Imaging Data Products and Mosaics
• A Unified, Merger-Driven Model for the Origin of Starbursts, Quasars, the Cosmic X-Ray Background, Supermassive Black Holes and Galaxy Spheroids
• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• GOODS-Herschel: an infrared main sequence for star-forming galaxies
• The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• 3D-HST: A wide-field grism spectroscopic survey with the Hubble Space Telescope
• Toward the Standard Population Synthesis Model of the X-Ray Background: Evolution of X-Ray Luminosity and Absorption Functions of Active Galactic Nuclei Including Compton-Thick Populations
• First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• The Chandra Deep Field-South Survey: 4 Ms Source Catalogs
• An X-ray Spectral Model for Compton-Thick Toroidal Reprocessors
• Deep Extragalactic X-ray Surveys
• The Chandra COSMOS Survey, I: Overview and Point Source Catalog
• CANDELS: Constraining the AGN-Merger Connection with Host Morphologies at z~2
• Absorption Properties and Evolution of Active Galactic Nuclei
• Bayesian Estimation of Hardness Ratios: Modeling and Computations
• The Space Density of Compton Thick AGN and the X-ray Background
• CANDELS Multiwavelength catalogs: Source Identification and Photometry in the CANDELS UKIDSS Ultra-Deep Survey Field
• Compton-thick Accretion in the local Universe
• Obscuration-dependent evolution of Active Galactic Nuclei
• Innovations in the Analysis of Chandra-ACIS Observations
• Fueling Low-Level AGN Activity Through the Stochastic Accretion of Cold Gas
• The Chandra COSMOS Survey: III. Optical and Infrared Identification of X-ray Point Sources
• Stellar black holes at the dawn of the universe
• AEGIS-X: The Chandra Deep Survey of the Extended Groth Strip
• Growing supermassive black holes in the late stages of galaxy mergers are heavily obscured
• Tracing the first stars with cosmic infrared background fluctuations
• Galaxy Interactions Trigger Rapid Black Hole Growth: an unprecedented view from the Hyper Suprime-Cam Survey
• HST WFC3/IR Observations of Active Galactic Nucleus Host Galaxies at z~2: Supermassive Black Holes Grow in Disk Galaxies
• The Subaru/XMM-Newton Deep Survey (SXDS): III. X-Ray Data
• The 2 Ms Chandra Deep Field-North Survey and the 250 ks Extended Chandra Deep Field-South Survey: Improved Point-Source Catalogs
• AEGIS-X: Deep Chandra imaging of the Central Groth Strip
• Host Galaxy Properties of the Swift BAT Ultra Hard X-ray Selected AGN
• Are Compton-Thick AGN the Missing Link Between Mergers and Black Hole Growth?
• A new method for determining the sensitivity of X-ray imaging observations and the X-ray number counts
• ASMOOTH: A simple and efficient algorithm for adaptive kernel smoothing of two-dimensional imaging data
• The XMM-Newton Wide field survey in the COSMOS field: redshift evolution of AGN bias and subdominant role of mergers in triggering moderate luminosity AGN at redshift up to 2.2
• Constraining the fraction of Compton-thick AGN in the Universe by modelling the diffuse X-ray background spectrum
• New measurements of the cosmic infrared background fluctuations in deep Spitzer/IRAC survey data and their cosmological implications
• A deep Chandra observation of the Groth Strip. I. The X-ray data
• Compton thick active galactic nuclei in Chandra surveys
• The evolution of the Compton thick fraction and the nature of obscuration for AGN in the Chandra Deep Field South
• The Hard X-Ray Luminosity Function of High-Redshift ($3<z\lesssim 5$) Active Galactic Nuclei
• Cross-correlating cosmic IR and X-ray background fluctuations: evidence of significant black hole populations among the CIB sources
• Reconstructing the Near-IR Background Fluctuations from known Galaxy Populations using Multiband Measurements of Luminosity Functions
• AKARI observation of the fluctuation of the near-infrared background
• An XMM-Newton spectral survey of 12 micron selected galaxies. II. Implications for AGN selection and unification
• The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background
• The host galaxies of X-ray selected Active Galactic Nuclei to z=2.5: Structure, star-formation and their relationships from CANDELS and Herschel/PACS
• Evidence for Merger-Driven Growth in Luminous, High-z, Obscured AGN in the CANDELS/COSMOS Field
• Lifting the Veil on Obscured Accretion: Active Galactic Nuclei Number Counts and Survey Strategies for Imaging Hard X-ray Missions
• Limits on the high redshift growth of massive black holes
• Scattered X-rays in Obscured Active Galactic Nuclei and their Implications for Geometrical Structure and Evolution
• Spectral and morphological properties of quasar hosts in SPH simulations of AGN feeding by mergers
• X-ray colour-colour selection for heavily absorbed AGN

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