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Exploring the role of cosmological shock waves in the Dianoga simulations of galaxy clusters

Exploring the role of cosmological shock waves in the Dianoga simulations of galaxy clusters

Authors :
Planelles, Susana
Borgani, Stefano
Quilis, Vicent
Murante, Giuseppe
Biffi, Veronica
Rasia, Elena
Dolag, Klaus
Granato, Gian Luigi
Ragone-Figueroa, Cinthia
Publication Year :
2021

Abstract

Cosmological shock waves are ubiquitous to cosmic structure formation and evolution. As a consequence, they play a major role in the energy distribution and thermalization of the intergalactic medium (IGM). We analyze the Mach number distribution in the Dianoga simulations of galaxy clusters performed with the SPH code GADGET-3. The simulations include the effects of radiative cooling, star formation, metal enrichment, supernova and active galactic nuclei feedback. A grid-based shock-finding algorithm is applied in post-processing to the outputs of the simulations. This procedure allows us to explore in detail the distribution of shocked cells and their strengths as a function of cluster mass, redshift and baryonic physics. We also pay special attention to the connection between shock waves and the cool-core/non-cool core (CC/NCC) state and the global dynamical status of the simulated clusters. In terms of general shock statistics, we obtain a broad agreement with previous works, with weak (low-Mach number) shocks filling most of the volume and processing most of the total thermal energy flux. As a function of cluster mass, we find that massive clusters seem more efficient in thermalising the IGM and tend to show larger external accretion shocks than less massive systems. We do not find any relevant difference between CC and NCC clusters. However, we find a mild dependence of the radial distribution of the shock Mach number on the cluster dynamical state, with disturbed systems showing stronger shocks than regular ones throughout the cluster volume.<br />Comment: 19 pages, 15 figures, accepted for publication in MNRAS

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2108.09670
Document Type :
Working Paper
Full Text :
https://doi.org/10.1093/mnras/stab2436