The mass–metallicity and fundamental metallicity relations in non-AGN and AGN-host galaxies

Author:

Li Song-Lin12,Grasha Kathryn12ORCID,Krumholz Mark R12ORCID,Wisnioski Emily12ORCID,Sutherland Ralph S1,Kewley Lisa J123,Chen Yan-Mei456,Li Zefeng127ORCID

Affiliation:

1. Research School of Astronomy and Astrophysics, Australian National University , Canberra, ACT 2611 , Australia

2. ARC Centre of Excellence for All-Sky Astrophysics in 3 Dimensions (ASTRO 3D) , Canberra, ACT 2611 , Australia

3. Institute for Theory and Computation, Harvard-Smithsonian Center for Astrophysics , Cambridge, MA 02138 , USA

4. School of Astronomy and Space Science, Nanjing University , Nanjing 210023 , China

5. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education , Nanjing 210023 , China

6. Collaborative Innovation Center of Modern Astronomy and Space Exploration , , Nanjing 210023 , China

7. Department of Physics, Centre for Extragalactic Astronomy, Durham University , South Road, Durham DH1 3LE , UK

Abstract

ABSTRACT Galaxies’ stellar masses, gas-phase oxygen abundances (metallicity), and star formation rates (SFRs) obey a series of empirical correlations, most notably the mass–metallicity relation (MZR) and fundamental metallicity relation (FZR), which relates oxygen abundance to a combination of stellar mass and SFR. However, due to the difficulty of measuring oxygen abundances and SFRs in galaxies that host powerful active galactic nuclei (AGN), to date it is unknown to what extent AGN-host galaxies also follow these correlations. In this work, we apply Bayesian methods to the MaNGA integral field spectrographic (IFS) survey that allow us to measure oxygen abundances and SFRs in AGN hosts, and use these measurements to explore how the MZR and FZR differ between galaxies that do and do not host AGN. We find similar MZRs at stellar masses above $10^{10.5} \, \mathrm{M}_\odot$, but that at lower stellar masses AGN hosts show up to $\sim 0.2$ dex higher oxygen abundances. The offset in the FZR is significantly smaller, suggesting that the larger deviation in the MZR is a result of AGN-host galaxies having systematically lower SFRs at fixed stellar mass. However, within the AGN-host sample there is little correlation between SFR and oxygen abundance. These findings support a scenario in which an AGN can halt efficient gas accretion, which drives non-AGN host galaxies to both higher SFR and lower oxygen abundance, resulting in the galaxy evolving off the star-forming main sequence (SFMS). As a consequence, as the SFR declines for an individual system its metallicity remains mostly unchanged.

Funder

Australian Research Council

Publisher

Oxford University Press (OUP)

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