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Gauging the effect of feedback from QSOs on their host galaxies

Published online by Cambridge University Press:  29 March 2021

Bruno Dall’Agnol de Oliveira Open the ORCID record for Bruno Dall’Agnol de Oliveira [Opens in a new window]  and
Thaisa Storchi-Bergmann
Bruno Dall’Agnol de Oliveira
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, IF, CP 15051, 91501-970 Porto Alegre, RS, Brazil email: [email protected]
Thaisa Storchi-Bergmann
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, IF, CP 15051, 91501-970 Porto Alegre, RS, Brazil email: [email protected]
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Abstract

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Often associated with the regulation of star formation in galaxies, active galactic nuclei (AGN) play a fundamental role in the evolution of galaxies through their feedback effects. To investigate the impact of these effects, we analysed the optical emission-line properties of 8 type II AGNs with bolometric luminosities LBol > 1045 erg s−1, using integral field spectroscopy (IFS) observations with Gemini Multi-Object Spectrograph (GMOS). The gas kinematics was obtained by fitting Gaussian components to the profiles of the emission lines of the ionized gas. Using only the broadest component – that we associate with the gas in outflow – we calculated the mass outflow rate (Ṁout), finding values of up to 10 M⊙ yr−1. The outflow kinetic power (Ėout reaches maximum values between 1041 and 1043 erg s−1, which correspond to feedback efficiencies of ∼0.001−0.1 % of Lbol. These values are below that required to quench the star formation during the evolution of galaxies in simulations and analytical models. We also investigated the effect of uncertainties on the values of the physical quantities used in the calculations – such as the electron density – on the final values of Ṁout and Ėout.

Keywords

galaxies: activegalaxieskinematics and dynamicsquasars: emission lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 265 - 266
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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