Here 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; Laird et~al. 2009), these provide data to a nominal exposure depth of 800ks 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 catalogue of 937 point sources detected in the deep chandra observations. We present identifications of our X-ray sources from deep ground-based, Spitzer, GALEX and HST imaging. Using a likelihood ratio analysis, we associate multi band 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 354 of our X-ray sources are provided predominantly from Keck (DEEP2/3) and MMT Hectospec, so the current spectroscopic completeness is about 38%. For the remainder of the X-ray sources, we compute photometric redshifts based on multi-band 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 AGN and require hybrid templates. Our photometric redshifts have typical accuracy of σ=0.05 and an outlier fraction of approximately 5%. The X-ray, multi-wavelength photometry and redshift catalogues presented in Nandra et al. 2015, are made publicly available through these pages. In particular we provide:

Layout of the AEGIS field with indicated the location of the Chandra X-ray imaging. The 200ks AEGIS-XW area (Laird et al. 2009) is shown as the greyscale image.caption text

• X-ray images.


• Source list with the Xray properties (positions, fluxes, etc.) as described in Nandra et al. 2015


• Spectroscopic and/or photometric redshifts for the optical/NIR candidate counterparts. SED fitting and entire P(z) for each of the candidates counterparts is also provided.


• X-ray Spectral analysis was performed by Buchner et al. 2015, following the methods described in Buchner et al. 2014. The catalog and visual representation of the SED fitting can also be found following this link.


• In Brightman et al. (2014), an X-ray spectral analysis was carried out for the AEGIS-X sources using the redshifts described on this page. This analysis determined the absorption (NH) and intrinsic X-ray luminosity of each source, the results of which are available here.


• Direct link to Rainbow web page ( for Europe and for USA) for cutouts and further information on the counterparts. The quantities as host masses are computed at the spectroscopic redshift when avaialble. However, currently the fit is done not taking into account the AGN component.


• Templates of galaxies, AGN and galaxy/AGN hybrids used for the computation of the photometric redshifts as described in Nandra et al. 2015