Stacked rest-frame X-ray spectra from the 4 Ms CDF South
As part of a Chandra archive data analysis program (SP8-9001), we have extracted rest-frame X-ray spectra for all sources with robust spectroscopic redshifts in the 4 Ms Chandra Deep Field South. We have re-processed the observations, creating level 1 event files with CTI corrections but no time-dependent gain corrections (as these are applied during the spectral stacking procedure, which de-redshifts the observed energies for each photon, and creates redshift-corrected response functions which can be coadded).
Public data products
We have produced flare-cleaned event files for all CDFS pointings, using the lightcurve cleaning technique described in Hickox et al. (2006). The cleaned event files are available here (approx 350 MB).
In the stacked X-ray spectra, we detected significant Fe Kalpha emission for moderate-luminosity AGN (~10^42 erg/s), indicative of a large obscured population or high reflection fraction in this population. This was presented by Trouille, Hickox & Alexander in two AAS posters (figures from one example is shown below), and will be presented in an upcoming publication that also includes a modeling of the observed trend (Hickox et al. in prep).
Last Updated: 14 July 2017