AEGIS-X: The Chandra deep survey of the extended groth strip

E. S. Laird, K. Nandra, A. Georgakakis, J. A. Aird, P. Barmby, C. J. Conselice, A. L. Coil, M. Davis, S. M. Faber, G. G. Fazio, P. Guhathakurta, D. C. Koo, V. Sarajedini, C. N.A. Willmer

Research output: Contribution to journalArticlepeer-review

169 Scopus citations


We present the AEGIS-X survey, a series of deep Chandra ACIS-I observations of the Extended Groth Strip. The survey comprises pointings at eight separate positions, each with nominal exposure of 200 ks, covering a total area of approximately 0.67deg2 in a strip of length 2 degrees. We describe in detail an updated version of our data reduction and point-source-detection algorithms used to analyze these data. A total of 1325 bandmerged sources have been found to a Poisson probability limit of 4 x 1O-6, with limiting fluxes of 5.3 x 10-17 erg cm2 s-1 in the soft (0.5-2 keV) band and 3.8 x 10-16 erg cm-2 s-1 in the hard (2-10 keV) band. We present simulations verifying the validity of our source-detection procedure and showing a very small, ≤ 1.5%, contamination rate from spurious sources. Optical/NIR counterparts have been identified from the DEEP2, CFHTLS, and Spitzer/Infrared Array Camera (IRAC) surveys of the same region. Using a likelihood ratio method, we find optical counterparts for 76% of our sources, complete to RAB = 24.1, and, of the 66% of the sources that have IRAC coverage, 94% have a counterpart to a limit of 0.9μJy at 3.6 μm (mAB = 23.8). After accounting for (small) positional offsets in the eight Chandra fields, the astrometrie accuracy of Chandra positions is found to be 8 rms; however, this number depends both on the off-axis angle and the number of detected counts for a given source. All data products described in this paper are made available via a public Web site.

Original languageEnglish (US)
Pages (from-to)102-116
Number of pages15
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - 2009


  • Galaxies: active
  • Galaxies: nuclei
  • Surveys
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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