Separating line emission from star formation, shocks, and AGN ionization in NGC 1068. Issue 3 (10th June 2019)

• Record Type: Journal Article
• Authors: D'Agostino, Joshua J; Kewley, Lisa J; Groves, Brent A; Medling, Anne M; Di Teodoro, Enrico; Dopita, Michael A; Thomas, Adam D; Sutherland, Ralph S; Garcia-Burillo, Santiago
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 487:Issue 3(2019)
• Page Start: 4153
• Page End: 4168
• Publication Date: 2019-06-10
• Subjects: ISM: jets and outflows -- galaxies: active -- galaxies: evolution -- galaxies: ISM -- galaxies: Seyfert -- galaxies: star formation; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz1611
• Languages: English
• ISSNs: 0035-8711

Abstract

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.