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Published online by Cambridge University Press: 07 August 2017
Most studies of active galaxies have concentrated on their unresolved nuclear regions because this is where their prodigous energy output originates. With the advent of CCDs, recent work has centered on determining how an AGN affects its host galaxy. To isolate the effect of an AGN on its host galaxy, a comparison between a set of galaxies containing active nuclei and a set of normal galaxies would be useful. In principle, if the active and normal galaxy samples are chosen properly, then any systematic differences found between the two samples in the line emission and/or continuum properties of the host galaxy can be attributed to nuclear activity.