Dale D. Kocevski
X-UDS: The Chandra Legacy Survey of the UKIDSS Ultra Deep Survey Field
Kocevski, Dale D.; Hasinger, Guenther; Brightman, Murray; Nandra, Kirpal; Georgakakis, Antonis; Cappelluti, Nico; Civano, Francesca; Li, Yuxuan; Li, Yanxia; Aird, James; Alexander, David M.; Almaini, Omar; Brusa, Marcella; Buchner, Johannes; Comastri, Andrea; Conselice, Christopher J.; Dickinson, Mark A.; Finoguenov, Alexis; Gilli, Roberto; Koekemoer, Anton M.; Miyaji, Takamitsu; Mullaney, James R.; Papovich, Casey; Rosario, David; Salvato, Mara; Silverman, John D.; Somerville, Rachel S.; Ueda, Yoshihiro
Authors
Guenther Hasinger
Murray Brightman
Kirpal Nandra
Antonis Georgakakis
Nico Cappelluti
Francesca Civano
Yuxuan Li
Yanxia Li
James Aird
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
Omar Almaini
Marcella Brusa
Johannes Buchner
Andrea Comastri
Christopher J. Conselice
Mark A. Dickinson
Alexis Finoguenov
Roberto Gilli
Anton M. Koekemoer
Takamitsu Miyaji
James R. Mullaney
Casey Papovich
David Rosario
Mara Salvato
John D. Silverman
Rachel S. Somerville
Yoshihiro Ueda
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 deg2. The observations are combined to provide a nominal depth of ~600 ks in the central 100 arcmin2 region of the field that has been imaged with Hubble/WFC3 by the CANDELS survey and ~200 ks 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 × 10−4. In addition, we present the results of an X-ray spectral analysis and provide best-fitting neutral hydrogen column densities, N 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 ~ 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.
Citation
Kocevski, D. D., Hasinger, G., Brightman, M., Nandra, K., Georgakakis, A., Cappelluti, N., …Ueda, Y. (2018). X-UDS: The Chandra Legacy Survey of the UKIDSS Ultra Deep Survey Field. Astrophysical Journal Supplement, 236(2), Article 48. https://doi.org/10.3847/1538-4365/aab9b4
Journal Article Type | Article |
---|---|
Acceptance Date | Jan 29, 2018 |
Online Publication Date | Jun 14, 2018 |
Publication Date | Jun 14, 2018 |
Deposit Date | Jul 5, 2018 |
Publicly Available Date | Jul 5, 2018 |
Journal | Astrophysical Journal Supplement |
Print ISSN | 0067-0049 |
Electronic ISSN | 1538-4365 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 236 |
Issue | 2 |
Article Number | 48 |
DOI | https://doi.org/10.3847/1538-4365/aab9b4 |
Public URL | https://durham-repository.worktribe.com/output/1355234 |
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Copyright Statement
© 2018. The American Astronomical Society. All rights reserved.
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