Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published September 2015 | Published + Submitted
Journal Article Open

AEGIS-X: Deep Chandra Imaging of the Central Groth Strip


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 deg2. This is currently the third deepest X-ray survey in existence; a factor ~2-3 shallower than the Chandra Deep Fields (CDFs), but over an area ~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 ~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 σ = 0.04 and an outlier fraction of approximately 5%, reaching σ = 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.

Additional Information

© 2015 American Astronomical Society. Received 2014 April 8; accepted 2015 March 29; published 2015 September 9. We thank those who built and operate the Chandra X-ray observatory so successfully. We acknowledge financial support from Chandra grant G08-9129 A, NSF grant AST-0808133, US National Science Foundation via grant AST-0806732. P. G. P.-P. acknowledges support from the Spanish Programa Nacional de Astronomía y Astrofísica under grant AYA2012-37727. This work made use of the Rainbow Cosmological Surveys Database, which is operated by the Universidad Complutense de Madrid (UCM) partnered with the University of California Observatories at Santa Cruz (UCO/Lick,UCSC). Facilities: CXO(ACIS) - Chandra X-ray Observatory satellite, CFHT - Canada-France-Hawaii Telescope, GALEX - Galaxy Evolution Explorer satellite, Hale - Palomar Observatory's 5.1m Hale Telescope, HST - Hubble Space Telescope satellite, Keck: I - , Keck: II - , Mayall - Kitt Peak National Observatory's 4 meter Mayall Telescope, MMT - MMT at Fred Lawrence Whipple Observatory, Sloan - Sloan Digital Sky Survey Telescope, Subaru - Subaru Telescope, Spitzer(IRAC) - Spitzer Space Telescope satellite.

Attached Files

Submitted - 1503.09078v1.pdf

Published - Nandra_2015p10.pdf


Files (5.2 MB)
Name Size Download all
1.7 MB Preview Download
3.5 MB Preview Download

Additional details

August 20, 2023
August 20, 2023