Separating line emission from star formation, shocks, and AGN ionization in NGC 1068

Joshua J. D'Agostino*, Lisa J. Kewley, Brent A. Groves, Anne M. Medling, Enrico Di Teodoro, Michael A. Dopita, Adam D. Thomas, Ralph S. Sutherland, Santiago Garcia-Burillo

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    34 Citations (Scopus)

    Abstract

    In the optical spectra of galaxies, the separation of line emission from gas ionized by star formation and an active galactic nucleus (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 α 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.

    Original languageEnglish
    Pages (from-to)4153-4168
    Number of pages16
    JournalMonthly Notices of the Royal Astronomical Society
    Volume487
    Issue number3
    DOIs
    Publication statusPublished - 11 Aug 2019

    Fingerprint

    Dive into the research topics of 'Separating line emission from star formation, shocks, and AGN ionization in NGC 1068'. Together they form a unique fingerprint.

    Cite this