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We present the properties of X-ray detected dust obscured galaxies (DOGs) inthe Chandra Deep Field South. In recent years, it has been proposed that asignificant percentage of the elusive Compton-thick (CT) active galactic nuclei(AGN) could be hidden among DOGs. In a previous work, we presented theproperties of X-ray detected DOGs by making use of the deepest X-rayobservations available at that time, the 2Ms observations of the Chandra deepfields. In that work, we only found a moderate percentage ($<$ 50%) of CT AGNamong the DOGs sample, but we were limited by poor photon statistics. In thispaper, we use not only a deeper 6 Ms Chandra survey of the Chandra Deep FieldSouth (CDF-S), but combine these data with the 3 Ms XMM-Newton survey of theCDF-S. We also take advantage of the great coverage of the CDF-S region fromthe UV to the far-IR to fit the spectral energy distributions (SEDs) of oursources. Out of the 14 AGN composing our sample, 9 are highly absorbed (butonly 3 could be CT AGN), whereas 2 look unabsorbed, and the other 3 are onlymoderately absorbed. In only one of the CT AGN, we detect a strong Fe K$\alpha$emission line; the source is already classified as a CT AGN with Chandra datain a previous work. For the other two CT candidates, the non-detection of theline could be because of the low number of counts in their X-ray spectra, buttheir location in the L$_{\rm 2-10\,keV}$/L$_{12\mu m}$ plot supports their CTclassification. Although a higher number of CT sources could be hidden amongthe X-ray undetected DOGs, our results indicate that DOGs could be as wellcomposed of only a fraction of CT AGN plus a number of moderate to highlyabsorbed AGN, as previously suggested. From our study of the X-ray undetectedDOGs in the CDF-S, we estimate a percentage between 13 and 44% of CT AGN amongthe whole population of DOGs.

X-ray observations of dust obscured galaxies in the Chandra Deep Field South