The Effects of AGN Feedback on Present-Day Galaxy Properties in Cosmological Simulations
Date
2015
Authors
Taylor, Philip
Kobayashi, Chiaki
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Blackwell Publishing Ltd
Abstract
We show that feedback from active galactic nuclei (AGN) plays an essential role in
reproducing the down-sizing phenomena, namely: the colour-magnitude relation; specific
star formation rates; and the α enhancement of early type galaxies. In our AGN
model, black holes originate from Population iii stars, in contrast to the merging scenario
of previous works. In this paper, we show how the properties of present-day
galaxies in cosmological chemo-hydrodynamical simulations change when we include
our model for AGN feedback. Massive galaxies become redder, older, less massive,
less compact, and show greater α enhancement than their counterparts without AGN.
Since we reproduce the black hole mass and galaxy mass relation, smaller galaxies do
not host a supermassive black hole and their star formation history is affected very
little, but they can get external enrichment from nearby AGN depending on their environment.
Nonetheless, the metallicity change is negligible, and the mass–metallicity
relations, which are mainly generated by supernova feedback at the first star burst,
are preserved.
Key words: black hole ph
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Monthly Notices of the Royal Astronomical Society
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Journal article
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Open Access
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