# The Role of Active Galactic Nuclei in the Quenching of Massive Galaxies in the SQuIGG$\vec{L}$E Survey

Greene, Jenny E; Setton, David; Bezanson, Rachel; Suess, Katherine A; Kriek, Mariska; Spilker, Justin S; Goulding, Andy D; Feldmann, Robert (2020). The Role of Active Galactic Nuclei in the Quenching of Massive Galaxies in the SQuIGG$\vec{L}$E Survey. Astrophysical Journal Letters, 899(1):L9.

## Abstract

We study the incidence of nuclear activity in a large sample of massive post-starburst (PSB) galaxies at $z\sim 0.7$ selected from the Sloan Digital Sky Survey, and identify active galactic nuclei based on radio continuum and optical emission lines. Over our mass range of ${10}^{10.6}\mbox{--}{10}^{11.5}$ ${M}_{\odot }$, the incidence of radio activity is weakly dependent on stellar mass and independent of stellar age, while radio luminosity depends strongly on stellar mass. Optical nuclear activity incidence depends most strongly on the Dn4000 line index, a proxy for stellar age, with an active fraction that is ~10 times higher in the youngest versus oldest PSB galaxies. Since a similar trend is seen between age and molecular gas fractions, we argue that, like in local galaxies, the age trend reflects a peak in available fueling rather than feedback from the central black hole on the surrounding galaxy.

## Abstract

We study the incidence of nuclear activity in a large sample of massive post-starburst (PSB) galaxies at $z\sim 0.7$ selected from the Sloan Digital Sky Survey, and identify active galactic nuclei based on radio continuum and optical emission lines. Over our mass range of ${10}^{10.6}\mbox{--}{10}^{11.5}$ ${M}_{\odot }$, the incidence of radio activity is weakly dependent on stellar mass and independent of stellar age, while radio luminosity depends strongly on stellar mass. Optical nuclear activity incidence depends most strongly on the Dn4000 line index, a proxy for stellar age, with an active fraction that is ~10 times higher in the youngest versus oldest PSB galaxies. Since a similar trend is seen between age and molecular gas fractions, we argue that, like in local galaxies, the age trend reflects a peak in available fueling rather than feedback from the central black hole on the surrounding galaxy.

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Institute for Computational Science 530 Physics Physical Sciences > Astronomy and Astrophysics Physical Sciences > Space and Planetary Science Space and Planetary Science, Astronomy and Astrophysics English 6 August 2020 15 Feb 2021 09:15 16 Feb 2021 21:00 IOP Publishing 2041-8205 Closed Publisher DOI. An embargo period may apply. https://doi.org/10.3847/2041-8213/aba534 : FunderSNSF: Grant IDPP00P2_157591: Project TitleAiming for the Parsec Scale - Star Formation and Feedback Processes in High Redshift Galaxies

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