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

Joshua J. D'Agostino*, Henry Poetrodjojo, I. Ting Ho, Brent Groves, Lisa Kewley, Barry F. Madore, Jeff Rich, Mark Seibert

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    We demonstrate a robust method of resolving the star formation and AGN contributions to emission lines using two very well known AGN systems: NGC 1365 and NGC 1068, using the high spatial resolution data from the TYPHOON/PrISM survey. We expand the previous method of calculating the AGN fraction by using theoretical-based model grids rather than empirical points. The high spatial resolution of the TYPHOON/PrISM observations shows evidence of both star formation and AGN activity occurring in the nuclei of the two galaxies. We rebin the data to the lower resolutions, typically found in other integral field spectroscopy surveys such as SAMI, MaNGA, and CALIFA. The results show that when rebinned from the native resolution of TYPHOON (>200 pc pixel-1) to 1 kpc pixel-1, the effects include an ~3 kpc increase in the radius of measured AGN activity, and a factor of 2-7 increase in the detection of low surface brightness features such as shocks. All of this information is critical, because information on certain physical processesmay be lost at varying resolutions.Wemake recommendations for analysing data at current IFU survey resolutions.

    Original languageEnglish
    Pages (from-to)4907-4935
    Number of pages29
    JournalMonthly Notices of the Royal Astronomical Society
    Volume479
    Issue number4
    DOIs
    Publication statusPublished - 1 Oct 2018

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