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Establishing the impact of luminous AGN with multi-wavelength observations and simulations

Published online by Cambridge University Press:  28 October 2024

C. M. Harrison Open the ORCID record for C. M. Harrison [Opens in a new window] ,
A. Girdhar  and
S. R. Ward
C. M. Harrison*
Affiliation:
School of Mathematics, Statistics and Physics, Newcastle University, U.K.
A. Girdhar
Affiliation:
School of Mathematics, Statistics and Physics, Newcastle University, U.K. European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany Ludwig Maximilian Universität, Professor-Huber-Platz 2, 80539 Müunchen, Germany
S. R. Ward
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching bei München, Germany Ludwig Maximilian Universität, Professor-Huber-Platz 2, 80539 Müunchen, Germany Excellence Cluster ORIGINS, Boltzmannstraße 2, 85748 Garching bei München, Germany
*
email: [email protected]
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Abstract

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Cosmological simulations fail to reproduce realistic galaxy populations without energy injection from active galactic nuclei (AGN) into the interstellar medium (ISM) and circumgalactic medium (CGM); a process called ‘AGN feedback’. Consequently, observational work searches for evidence that luminous AGN impact their host galaxies. Here, we review some of this work. Multi-phase AGN outflows are common, some with potential for significant impact. Additionally, multiple feedback channels can be observed simultaneously; e.g., radio jets from ‘radio quiet’ quasars can inject turbulence on ISM scales, and displace CGM-scale molecular gas. However, caution must be taken comparing outflows to simulations (e.g., kinetic coupling efficiencies) to infer feedback potential, due to a lack of comparable predictions. Furthermore, some work claims limited evidence for feedback because AGN live in gas-rich, star-forming galaxies. However, simulations do not predict instantaneous, global impact on molecular gas or star formation. The impact is expected to be cumulative, over multiple episodes.

Keywords

active galactic nucleiquasarsfeedbackgalaxy evolution
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S378: Black Hole Winds at All Scales , December 2023 , pp. 57 - 62
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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