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Journal Article

Enhancing AGN efficiency and cool-core formation with anisotropic thermal conduction

MPS-Authors

Barnes,  David J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kannan,  Rahul
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vogelsberger,  Mark
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pfrommer,  Christoph
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Puchwein,  Ewald
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Weinberger,  Rainer
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Springel,  Volker
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pakmor,  Rüdiger
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nelson,  Dylan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marinacci,  Federico
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pillepich,  Annalisa
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Torrey,  Paul
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernquist,  Lars
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.488.3003B
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Citation

Barnes, D. J., Kannan, R., Vogelsberger, M., Pfrommer, C., Puchwein, E., Weinberger, R., et al. (2019). Enhancing AGN efficiency and cool-core formation with anisotropic thermal conduction. Monthly Notices of the Royal Astronomical Society, 488, 3003-3013.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D1E4-D
Abstract
Understanding how baryonic processes shape the intracluster medium (ICM) is of critical importance to the next generation of galaxy cluster surveys. However, many models of structure formation neglect potentially important physical processes, like anisotropic thermal conduction (ATC). We explore the impact of ATC on the prevalence of cool-cores (CCs) via 12 pairs of magnetohydrodynamical galaxy cluster simulations, using the IllustrisTNG model with and without ATC. Examining their properties we find that the addition of ATC has a negligible impact on the median rotation measure, plasma β, the magnetic field-radial direction angle, and the effective Spitzer value. However, the scatter in the angle and effective Spitzer value is 50 per cent larger with ATC because the magnetic field aligns with the azimuthal direction to a greater extent in relaxed clusters. ATC's impact varies from cluster to cluster and with CC criterion, but its inclusion produces a systematic shift to larger CC fractions at z = 0 for all CC criteria considered. Additionally, the inclusion of ATC flattens the CC fraction redshift evolution, helping to ease the tension with the observed evolution. With ATC, the energy required for the central black hole to self-regulate is reduced by 24 per cent and the gas fraction at 0.01 r_{500} increases by 100 per cent, producing larger CC fractions. ATC makes the ICM unstable to perturbations and the increased efficiency of AGN feedback suggests that its inclusion results in a greater level of mixing in the ICM, demonstrated by the 10 per cent reduction in central metallicity for clusters with ATC.