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Even in deep X-ray surveys, Compton-thick active galactic nuclei (CT AGNs,${\rm N_H} \geqslant 1.5~\times~10^{24}~{\rm cm}^{-2}$) are difficult to beidentified due to X-ray flux suppression and their complex spectral shape.However, the study of CT AGNs is vital for understanding the rapid growth ofblack holes and the origin of cosmic X-ray background. In the local universe,the fraction of CT AGNs accounts for 30% of the whole AGN population. We mayexpect a higher fraction of CT AGNs in deep X-ray surveys, however, only 10% ofAGNs have been identified as CT AGNs in the 7 Ms \textit{Chandra} DeepField-South (CDFS) survey. In this work, we select 51 AGNs with abundantmulti-wavelength data. Using the method of the mid-infrared (mid-IR) excess, weselect hitherto unknown 8 CT AGN candidates in our sample. Seven of thesecandidates can confirm as CT AGN based on the multi-wavelength identificationapproach, and a new CT AGN (XID 133) is identified through the mid-IRdiagnostics. We also discuss the X-ray origin of these eight CT AGNs and thereason why their column densities were underestimated in previous studies. Wefind that the multi-wavelength approaches of selecting CT AGNs are highlyefficient, provided the high quality of observational data. We also find thatCT AGNs have a higher Eddington ratio than non-CT AGNs, and that both CT AGNsand non-CT AGNs show similar properties of host galaxies.

Multi-wavelength Selected Compton-thick AGNs in Chandra Deep Field-South Survey