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The optical spectra of Seyfert galaxies are often dominated by emission linesexcited by both star formation and AGN activity. Standard calibrations (such asfor the star formation rate) are not applicable to such composite (mixed)spectra. In this paper, we describe how integral field data can be used tospectrally and spatially separate emission associated with star formation fromemission associated with accretion onto an active galactic nucleus (AGN). Wedemonstrate our method using integral field data for two AGN host galaxies (NGC5728 and NGC 7679) from the Siding Spring Southern Seyfert SpectroscopicSnapshot Survey (S7). The spectra of NGC 5728 and NGC 7679 form clear sequencesof AGN fraction on standard emission line ratio diagnostic diagrams. We showthat the emission line luminosities of the majority (> 85 per cent) of spectraalong each AGN fraction sequence can be reproduced by linear superpositions ofthe emission line luminosities of one AGN dominated spectrum and one starformation dominated spectrum. We separate the Halpha, Hbeta, [NII]$\lambda$6583, [S II]$\lambda \lambda$6716, 6731, [O III]$\lambda$5007 and[O II]$\lambda \lambda$3726, 3729 luminosities of every spaxel intocontributions from star formation and AGN activity. The decomposed emissionline images are used to derive the star formation rates and AGN bolometricluminosities for NGC 5728 and NGC 7679. Our calculated values are mostlyconsistent with independent estimates from data at other wavelengths. Therecovered star forming and AGN components also have distinct spatialdistributions which trace structures seen in high resolution imaging of thegalaxies, providing independent confirmation that our decomposition has beensuccessful.

Dissecting Galaxies: Spatial and Spectral Separation of Emission Excited by Star Formation and AGN Activity