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We perform spectral energy distribution (SED) fitting to 711 luminous X-rayAGN at 0.7 < z < 4.5 using 10-bands of optical and infra-red photometric datafor objects within XMM-SERVS. This fitting provided 510 reliable (reduced $\chi^2 < 3$) inferences on AGN and host galaxy properties. The AGN optical(3000\r{A}) luminosity inferred from SED-fitting is found to correlate with themeasured X-ray (2-10 keV) luminosity, in good agreement with previous work.Using X-ray hardness as a proxy for AGN obscuration, we also study thedifferences in the host galaxy properties of obscured and unobscured AGN. Bothpopulations have consistent stellar masses (log$_{10}(M_*/M_{\odot})$ = 10.88$\pm0.09M_\odot$ and log$_{10}(M_*/M_{\odot})$ = 10.8 $\pm0.1M_\odot$ forunobscured and obscured AGN respectively). We also find evidence for varyingAGN emission line properties from a standard AGN template in 18.8% of thesample with a reduced $\chi^2 < 3$ where the inclusion of an additionalemission line strength free parameter was found to improve the quality of thefit. Comparison of these fits to SDSS spectra showed that emission lineproperties inferred from broadband photometry were consistent with the resultsfrom spectroscopy for 91% of objects. We find that the presence of weaker, moreblueshifted emission lines as inferred from the SED fits are associated withmore negative values of $\alpha_{ox}$. While the correlation between thehardness of the ionising SED and the emission line properties has been knownfor some time, we are able to derive this correlation purely from broadbandphotometry.

A Fresh Look at AGN Spectral Energy Distribution Fitting with the XMM-SERVS AGN Sample