The Effects of AGN Feedback on Present-Day Galaxy Properties in Cosmological Simulations

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 $\alpha$ 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 $\alpha$ 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.

13 pages, 15 figures. Accepted for publication in MNRAS. Comments welcome

References in corpus (7)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• UV Star Formation Rates in the Local Universe
• Direct cosmological simulations of the growth of black holes and galaxies
• Simulations of Cosmic Chemical Enrichment
• Seeding Black Holes in Cosmological Simulations
• Mock observations with the Millennium simulation: Cosmological downsizing and intermediate redshift observations

Cited by in corpus (9)

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• The Absence of an Environmental Dependence in the Mass-Metallicity Relation at z=2
• The Metallicity and Elemental Abundance Gradients of Simulated Galaxies, and their Environmental Dependence
• Physical drivers of galaxies' cold-gas content: exploring environmental and evolutionary effects with DARK SAGE
• Time Evolution of Galaxy Scaling Relations in Cosmological Simulations
• AGN feedback and the origin of the $\alpha$ enhancement in early type galaxies - insights from the GAEA model
• The metal enrichment of passive galaxies in cosmological simulations of galaxy formation
• Star Formation in Simulated Galaxies: Understanding the Transition to Quiescence at $3\times 10^{10}$ M${}_{\odot }$
• Radial Distribution Of ISM Gas-phase Metallicity In CLASH Clusters at z~0.35: A New Outlook On Environmental Impact On Galaxy Evolution