Cosmic Feedback from AGN
A.C. Fabian (University of Cambridge, UK)
TL;DR
This paper reviews how active galactic nuclei (AGN) influence galaxy evolution through radiation, winds, and jets, affecting black hole growth and galaxy structure, supported by observational evidence.
Contribution
It provides a comprehensive overview of cosmic feedback mechanisms from AGN, highlighting their roles in galaxy formation and evolution.
Findings
Radiation pressure links black hole mass to galaxy properties.
Jets heat gas, preventing excessive galaxy growth.
Observations support feedback's role in shaping galaxies.
Abstract
Accretion onto the massive black hole at the centre of a galaxy can feed energy and momentum into its surroundings via radiation, winds and jets. Feedback due to radiation pressure can lock the mass of the black hole onto the M-sigma relation, and shape the final stellar bulge of the galaxy. Feedback due to the kinetic power of jets can prevent massive galaxies greatly increasing their stellar mass, by heating gas which would otherwise cool radiatively. The mechanisms involved in cosmic feedback are discussed and illustrated with observations.
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