Starburst–AGN mixing: TYPHOON observations of NGC 1365, NGC 1068, and the effect of spatial resolution on the AGN fraction

Abstract

We demonstrate a robust method of resolving the star-formation and AGN\ncontributions to emission lines using two very well known AGN systems: NGC\n1365, and NGC 1068, using the high spatial resolution data from the\nTYPHOON/PrISM survey. We expand the previous method of calculating the AGN\nfraction by using theoretical-based model grids rather than empirical points.\nThe high spatial resolution of the TYPHOON/PrISM observations show evidence of\nboth star formation and AGN activity occurring in the nuclei of the two\ngalaxies. We rebin the data to the lower resolutions, typically found in other\nintegral field spectroscopy surveys such as SAMI, MaNGA, and CALIFA. The\nresults show that when rebinned from the native resolution of TYPHOON (< 200\npc/pixel) to 1 kpc/pixel, the effects include a roughly 3 kpc increase in the\nradius of measured AGN activity, and a factor of 2 to 7 increase in the\ndetection of low surface brightness features such as shocks. All of this\ninformation is critical, because information on certain physical processes may\nbe lost at varying resolutions. We make recommendations for analysing data at\ncurrent IFU survey resolutions.\n