Separating Line Emission from Star Formation, Shocks, and AGN Ionisation
  in NGC 1068
  In the optical spectra of galaxies, the separation of line emission from gas
ionised by star formation and an AGN, or by star formation and shocks, are very
well-understood problems. However, separating line emission between AGN and
shocks has proven difficult. With the aid of a new three-dimensional diagnostic
diagram, we show the simultaneous separation of line emission from star
formation, shocks, and AGN in NGC 1068, and quantify the ratio of star
formation, shocks, and AGN in each spaxel. The AGN, shock, and star formation
luminosity distributions across the galaxy accurately align with X-ray, radio,
and CO(3-2) observations, respectively. Comparisons with previous separation
methods show that the shocked emission heavily mixes with the AGN emission. We
also show that if the H$\alpha$ flux is to be used as a star formation rate
indicator, separating line emission from as many sources as possible should be
attempted to ensure accurate results.
