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This prize-winning Ph.D. thesis by Chris Harrison adopts a
multi-faceted approach to address the lack of decisive
observational evidence, utilising large observational data sets
from several world-leading telescopes. Developing several novel
observational techniques, Harrison demonstrated that energetic
winds driven by Active Galactic Nuclei (AGN) are found in a large
number of galaxies, with properties in agreement with model
predictions. One of the key unsolved problems in astrophysics is
understanding the influence of AGN, the sites of growing
supermassive black holes, on the evolution of galaxies. Leading
theoretical models predict that AGN drive energetic winds into
galaxies, regulating the formation of stars. However, until now, we
have lacked the decisive observational evidence to confirm or
refute these key predictions. Careful selection of targets allowed
Harrison, to reliably place these detailed observations into the
context of the overall galaxy population. However, in disagreement
with the model predictions, Harrison showed that AGN have little
global effect on star formation in galaxies. Theoretical models are
now left with the challenge of explaining these results.
This prize-winning Ph.D. thesis by Chris Harrison adopts a
multi-faceted approach to address the lack of decisive
observational evidence, utilising large observational data sets
from several world-leading telescopes. Developing several novel
observational techniques, Harrison demonstrated that energetic
winds driven by Active Galactic Nuclei (AGN) are found in a large
number of galaxies, with properties in agreement with model
predictions. One of the key unsolved problems in astrophysics is
understanding the influence of AGN, the sites of growing
supermassive black holes, on the evolution of galaxies. Leading
theoretical models predict that AGN drive energetic winds into
galaxies, regulating the formation of stars. However, until now, we
have lacked the decisive observational evidence to confirm or
refute these key predictions. Careful selection of targets allowed
Harrison, to reliably place these detailed observations into the
context of the overall galaxy population. However, in disagreement
with the model predictions, Harrison showed that AGN have little
global effect on star formation in galaxies. Theoretical models are
now left with the challenge of explaining these results.
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