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The physical parameters of galaxies and/or AGNs can be derived by fittingtheir multi-band spectral energy distributions (SEDs). By using CIGALE code, weperform multi-band SED fitting (from ultraviolet to infrared) for 791 X-raysources (518 AGNs and 273 normal galaxies) in the 7 Ms Chandra Deep Field-southsurvey (CDFS). We consider the contributions from AGNs and adopt more accurateredshifts than published before. Therefore, more accurate star formation rates(SFRs) and stellar masses (M$_*$) are derived. We classify the 518 AGNs intotype-I and type-II based on their optical spectra and their SEDs. Moreover, sixAGN candidates are selected from the 273 normal galaxies based on their SEDs.Our main results are as follows: (1) the host galaxies of AGNs have largerM$_*$ than normal galaxies, implying that AGNs prefer to host in massivegalaxies; (2) the specific star formation rates (sSFRs) of AGN host galaxiesare different from those of normal galaxies, suggesting that AGN feedback mayplay an important role in the star formation activity; (3) we find that thefraction of optically obscured AGNs in CDFS decreases with the increase ofintrinsic X-ray luminosity, which is consistent with previous studies;(4) thehost galaxies of type-I AGNs tend to have lower M$_*$ than type-II AGNs, whichmay suggest that dust in the host galaxy may also contribute to the opticalobscuration of AGNs.

Physical properties of the CDFS X-ray sources through fitting spectral energy distributions