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We identified three samples of ROSAT sources with Sloan Digital Sky Surveyspectra, one at redshift z = 0.1, a second one at z = 0.2 and a third one at z= 0.3. 812 sources in total were examined. We determined the nature andspectral sub-types of the sources by visual inspection. The fraction of eachsub-type at each of the three redshifts are then calculated. We considerselection biases caused by the luminosity cut-off threshold to determinewhether any systematic trends in AGN type are evident with increasing redshift.We hence probe if an evolution effect is detected in our sample.

Spectral comparison between AGN at z = 0.1, 0.2 and 0.3