AEGIS-X: Deep Chandra imaging of the central groth strip

K. Nandra, E. S. Laird, J. A. Aird, M. Salvato, A. Georgakakis, G. Barro, P. G. Perez-Gonzalez, P. Barmby, R. R. Chary, A. Coil, M. C. Cooper, M. Davis, M. Dickinson, S. M. Faber, G. G. Fazio, P. Guhathakurta, S. Gwyn, L. T. Hsu, J. S. Huang, R. J. IvisonD. C. Koo, J. A. Newman, C. Rangel, T. Yamada, C. Willmer

Research output: Contribution to journalArticlepeer-review

108 Scopus citations


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 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 and an outlier fraction of approximately 5%, reaching with less than 4% outliers in the area covered by CANDELS . The X-ray, multiwavelength photometry, and redshift catalogs are made publicly available.

Original languageEnglish (US)
Article number10
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Sep 1 2015


  • galaxies: active
  • galaxies: nuclei
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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  • AEGIS-X Deep survey of EGS (AEGIS-XD)

    Nandra, K. (Creator), Laird, E. S. (Creator), Aird, J. A. (Creator), Salvato, M. (Creator), Georgakakis, A. (Creator), Barro, G. (Creator), Perez-Gonzalez, P. G. (Creator), Barmby, P. (Creator), Chary, R. (Creator), Coil, A. (Creator), Cooper, M. C. (Creator), Davis, M. (Creator), Dickinson, M. (Creator), Faber, S. M. (Creator), Fazio, G. G. (Creator), Guhathakurta, P. (Creator), Gwyn, S. (Creator), Hsu, L. (Creator), Huang, J. (Creator), Ivison, R. J. (Creator), Koo, D. C. (Creator), Newman, J. A. (Creator), Rangel, C. (Creator), Yamada, T. (Creator), Willmer, C. N. (Creator), Nandra, K. (Creator), Barmby, P. (Creator), Dickinson, M. (Creator), Fazio, G. G. (Creator) & Newman, J. A. (Creator), Centre de Donnees Strasbourg (CDS), 2015


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