We propose CAM CVF imaging observations of the Circinus galaxy
which are necessary to follow-up interesting ISO results already
obtained with SWS and PHTS. The ISO spectra show prominent PAH/dust
features and emission lines of H2 and ions spanning a wide range of
ionization energies. Due to the large apertures of the ISO
spectrometers, however, we cannot separate the relative contributions
excited by the AGN and the starburst ring which we we have also
demonstrated to be present by extensive groundbased visible and
infrared observations. Determining the relative contribution of the
starburst and AGN to the PAH and low excitation ionic lines in
particular has become important to answer questions raised by our
initial interpretation of the ISO spectra using photoionization and
radiative transfer dust models. Based on our measured ISO integrated
line fluxes and the size of the starburst ring we expect that the
required spectral line images can be obtained with adequate s/n and
spatial resolution using the CAM LW CVF which covers most of the PAH
features and the critical [NeII], [NeIII] and [NeV] ionic
lines. Circinus is the closest (4 Mpc) example of a galaxy containing
a luminous AGN and surrounding starburst ring and is thus a unique target
for the proposed study.