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Cusp-core transformations induced by AGN feedback in the progenitors of cluster galaxies


Martizzi, D; Teyssier, R; Moore, B (2013). Cusp-core transformations induced by AGN feedback in the progenitors of cluster galaxies. Monthly Notices of the Royal Astronomical Society, 432(3):1947-1954.

Abstract

In a recent study, we used cosmological simulations to show that active galactic nuclei (AGN) feedback on the gas distribution in clusters of galaxies can be important in determining the spatial distribution of stars and dark matter in the central regions of these systems. The hierarchical assembly of dark matter, baryons and black holes obscures the physical mechanism behind the restructuring process. Here, we use idealized simulations to follow the response of a massive dark matter halo as we feed the central black hole with a controlled supply of cold gas. This removes most of the complexity taking place in the cosmological simulations that may have biased our previous study. We confirm our previous results: gas heated and expelled from the central regions of the halo by AGN feedback can return after cooling; repeated cycles generate gravitational potential fluctuations responsible for irreversible modifications of the dark matter mass profile. The main result is the expulsion of large amounts of baryons and dark matter from the central regions of the halo. According to the work presented here, outflow-induced fluctuations represent the only mechanism able to efficiently create dark matter cores in clusters of galaxies.

Abstract

In a recent study, we used cosmological simulations to show that active galactic nuclei (AGN) feedback on the gas distribution in clusters of galaxies can be important in determining the spatial distribution of stars and dark matter in the central regions of these systems. The hierarchical assembly of dark matter, baryons and black holes obscures the physical mechanism behind the restructuring process. Here, we use idealized simulations to follow the response of a massive dark matter halo as we feed the central black hole with a controlled supply of cold gas. This removes most of the complexity taking place in the cosmological simulations that may have biased our previous study. We confirm our previous results: gas heated and expelled from the central regions of the halo by AGN feedback can return after cooling; repeated cycles generate gravitational potential fluctuations responsible for irreversible modifications of the dark matter mass profile. The main result is the expulsion of large amounts of baryons and dark matter from the central regions of the halo. According to the work presented here, outflow-induced fluctuations represent the only mechanism able to efficiently create dark matter cores in clusters of galaxies.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:July 2013
Deposited On:05 Sep 2013 06:06
Last Modified:05 Apr 2016 16:58
Publisher:Wiley-Blackwell
ISSN:0035-8711
Additional Information:Authors should include the following credit line when depositing their accepted manuscripts: This article has been accepted for publication in onthly Notices of the Royal Astronomical Society ©: 2013 Published by Oxford University Press. All rights reserved.
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1093/mnras/stt297

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