Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 220, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/220/1/10
Keywords
galaxies: active; galaxies: nuclei; surveys
Categories
Funding
- Chandra grant [G08-9129 A]
- NSF grant [AST-0808133]
- US National Science Foundation [AST-0806732]
- Spanish Programa Nacional de Astronomia y Astrofisica [AYA2012-37727]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0808133] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [0806732] Funding Source: National Science Foundation
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We present the results of deep Chandra imaging of the central region of the Extended Groth Strip, the AEGIS-X Deep (AEGIS-XD) survey. When combined with previous Chandra observations of a wider area of the strip, AEGIS-X Wide (AEGIS-XW), these provide data to a nominal exposure depth of 800 ks in the three central ACIS-I fields, a region of approximately 0.29 deg(2). This is currently the third deepest X-ray survey in existence; a factor similar to 2-3 shallower than the Chandra Deep Fields (CDFs), but over an area similar to 3 times greater than each CDF. We present a catalog of 937 point sources detected in the deep Chandra observations, along with identifications of our X-ray sources from deep ground-based, Spitzer, GALEX, and Hubble Space Telescope imaging. Using a likelihood ratio analysis, we associate multiband counterparts for 929/937 of our X-ray sources, with an estimated 95% reliability, making the identification completeness approximately 94% in a statistical sense. Reliable spectroscopic redshifts for 353 of our X-ray sources are available predominantly from Keck (DEEP2/3) and MMT Hectospec, so the current spectroscopic completeness is similar to 38%. For the remainder of the X-ray sources, we compute photometric redshifts based on multiband photometry in up to 35 bands from the UV to mid-IR. Particular attention is given to the fact that the vast majority the X-ray sources are active galactic nuclei and require hybrid templates. Our photometric redshifts have mean accuracy of sigma = 0.04 and an outlier fraction of approximately 5%, reaching sigma = 0.03 with less than 4% outliers in the area covered by CANDELS. The X-ray, multiwavelength photometry, and redshift catalogs are made publicly available.
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