scholarly journals Thermal Conduction and Particle Transport in Strong Magnetohydrodynamic Turbulence, with Application to Galaxy Cluster Plasmas

2004 ◽  
Vol 602 (1) ◽  
pp. 170-180 ◽  
Author(s):  
Benjamin D. G. Chandran ◽  
Jason L. Maron
Keyword(s):  
Particle Transport ◽  
Thermal Conduction ◽  
Galaxy Cluster ◽  
Magnetohydrodynamic Turbulence

scholarly journals Propagation of weak shocks in cool-core galaxy clusters in two-temperature magnetohydrodynamics with anisotropic thermal conduction

2020 ◽  
Vol 497 (2) ◽  
pp. 1434-1442
Author(s):  
S Komarov ◽  
C Reynolds ◽  
E Churazov
Keyword(s):  
Electron Temperature ◽  
Thermal Conduction ◽  
Galaxy Cluster ◽  
Weak Shock ◽  
Heat Fluxes ◽  
Equilibration Time ◽  
Characteristic Spatial Scale ◽  
Magnetohydrodynamic Models ◽  
Weak Shocks ◽  
Perseus Cluster

ABSTRACT We investigate how different magnetohydrodynamic models of propagation of a weak (Mach number ∼1.2) shock in the core of a galaxy cluster affect its observational appearance, using the Perseus cluster as our fiducial model. In particular, we study how thermal conduction, both isotropic and anisotropic, and ion–electron temperature equilibration modify a weak shock. Strong thermal conduction is expected to produce an electron temperature precursor. Less prominent pressure and density precursors are formed as well. A longer equilibration time largely reduces the density precursor but does not change the electron temperature precursor much. When thermal conduction becomes anisotropic, the intracluster magnetic field imprints its characteristic spatial scale on the distortions of the shock induced by heat fluxes.

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

2019 ◽  
Vol 488 (3) ◽  
pp. 3003-3013 ◽  
Author(s):  
David J Barnes ◽  
Rahul Kannan ◽  
Mark Vogelsberger ◽  
Christoph Pfrommer ◽  
Ewald Puchwein ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Conduction ◽  
Galaxy Cluster ◽  
Azimuthal Direction ◽  
Physical Processes ◽  
Central Black Hole ◽  
Rotation Measure ◽  
Systematic Shift ◽  
The Impact ◽  
The Magnetic Field

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.

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