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Fig. 13

image

Comparison of our photometric redshifts estimated using TPZ and those estimated using ANNz (Smith et al. 2011) for the 65 common sources with our X-ATLAS X-ray AGN catalogue and the submm catalogue described in Valiante et al. (2016) and Bourne et al. (2016). Most of the discrepancy between the two photo-z estimates is located in the upper left part of the plot, i.e., ANNz computes lower redshift values than are obtained with our TPZ measurements. Most of this difference is likely due to the different training sets used in the two methods. The training sample of ANNz is constructed to better suit their test sample, the vast majority of which consists of galaxies. Our training sample (Sect. 3.2) consists of X-ray AGN (see text for more details).

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