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23 April 2024 |
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Effect of Active Galactic Nuclei Thermal Heating with Radial Dependence on Thermal Stability of Simulated Galaxy Clusters | | Forrest W. Glines
; Brian W. O'Shea
; G. Mark Voit
; | | Date: |
31 Mar 2020 | | Abstract: | Observations since the 1970’s have revealed the existence of cool-core (CC)
clusters, which are galaxy clusters with a central cooling time much shorter
than the age of the universe. Both observations and theory suggest that the
ambient gas at the centers of galaxy clusters is thermally regulated by a
central heating mechanism that suppresses condensation (most likely an active
galactic nucleus, or AGN). Previous analytical work has suggested specific
configurations of heating kernels that may result in thermal balance and a
steady state. To test this hypothesis, we simulated idealized galaxy clusters
using the ENZO cosmology code with a spatial heat-input kernel meant to mimic
feedback from a central AGN. Thermal heating as a function of radius was
injected according to a range of kernels, with global thermal balance enforced
at all times. We compare our simulation results with observed entropy profiles
from the ACCEPT cluster dataset. Although some heating kernels produced
thermally steady galaxy clusters, no kernel was able to produce a steady
cluster with a central entropy as low as the central entropies typically
observed among CC clusters. The general behavior of the simulations depended on
the amount of heating in the inner $10 ~ ext{kpc}$, with low central heating
leading to central cooling catastrophes, high central heating creating a
central convective zone with an inverted entropy gradient, and intermediate
heating leading to a flat but elevated entropy core. The simulated clusters
enter an unsteady multiphase state on a timescale proportional to the square of
the cooling time of the lowest entropy gas in the simulation, with centrally
concentrated heating resulting in a steady state lasting for a longer period of
time. | | Source: | arXiv, 2004.0021 | | Services: | Forum | Review | PDF | Favorites | |
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