This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/24515 in citations.
A Song of Shocks and Dynamo: Numerical Studies of a Galaxy Cluster Merger in the HIMAG Project
A Song of Shocks and Dynamo: Numerical Studies of a Galaxy Cluster Merger in the HIMAG Project
With ENZO simulations run on the Jülich supercomputers, we have investigated the evolution of magnetic fields in the largest cosmic structures (namely galaxy clusters and filaments connecting them) with unprecedented dynamical range. These simulations revealed the full development of the small-scale...
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Personal Name(s): | Wittor, Denis (Corresponding author) |
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Domínguez-Fernández, Paola / Vazza, Franco / Brüggen, Marcus | |
Contributing Institute: |
John von Neumann - Institut für Computing; NIC |
Published in: |
NIC Symposium 2020 |
Imprint: |
Jülich
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
2020
|
Physical Description: |
123 - 132 |
Conference: | NIC Symposium 2020, Jülich (Germany), 2020-02-27 - 2020-02-28 |
Document Type: |
Contribution to a book Contribution to a conference proceedings |
Research Program: |
Addenda |
Series Title: |
Publication Series of the John von Neumann Institute for Computing (NIC) NIC Series
50 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
With ENZO simulations run on the Jülich supercomputers, we have investigated the evolution of magnetic fields in the largest cosmic structures (namely galaxy clusters and filaments connecting them) with unprecedented dynamical range. These simulations revealed the full development of the small-scale dynamo in Eulerian cosmological magneto-hydrodynamical simulations. The turbulent motions developed during the formation of clusters are energetic enough to foster the growth of magnetic fields by several orders of magnitude, starting from weak magnetic fields up to strengths of ~ $\mu$G as observed. Furthermore, shock waves are launched during cluster formation and they are able to accelerate cosmic-ray electrons, that emit in the radio wavelengths. Radio observations of this emission provide information on the local magnetic field strength. We have incorporated, for the first time, the cooling of cosmic-ray electrons when modelling this emission. In this contribution, we present our advances in modelling these physical processes. Here, we mostly focus on the most interesting object in our sample of galaxy clusters, which shows the complexity of magnetic fields and the potential of existing and future multi-wavelengths observations in the study of the weakly collisional plasma on ~ Megaparsecs scales. |