Simulations of extragalactic magnetic fields and of their observables

Vazza, Franco ; Bruggen, Marcusi ; Gheller, Claudio ; Hackstein, Stefan ; Wittor, Denis ; Hinz, Paul (2017) Simulations of extragalactic magnetic fields and of their observables. Classical and Quantum Gravity, 34 (23). ISSN 1361-6382
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The origin of extragalactic magnetic fields is still poorly understood. Based on a dedicated suite of cosmological magneto-hydrodynamical simulations with the ENZO code we have performed a survey of different models that may have caused present-day magnetic fields in galaxies and galaxy clusters. The outcomes of these models differ in cluster outskirts, filaments, sheets and voids and we use these simulations to find observational signatures of magnetogenesis. With these simulations, we predict the signal of extragalactic magnetic fields in radio observations of synchrotron emission from the cosmic web, in Faraday rotation, in the propagation of ultra high energy cosmic rays, in the polarized signal from fast radio bursts at cosmological distance and in spectra of distant blazars. In general, primordial scenarios in which present-day magnetic fields originate from the amplification of weak (⩽nG ) uniform seed fields result in more homogeneous and relatively easier to observe magnetic fields than astrophysical scenarios, in which present-day fields are the product of feedback processes triggered by stars and active galaxies. In the near future the best evidence for the origin of cosmic magnetic fields will most likely come from a combination of synchrotron emission and Faraday rotation observed at the periphery of large-scale structures.

Document type
Vazza, FrancoUniversity of Bologna0000-0002-2821-7928
Bruggen, MarcusiUniversitat Hamburg
Gheller, ClaudioINAF, Bologna
Hackstein, StefanUniversitat Hamburg
Wittor, DenisUniversitat Hamburg
Hinz, PaulUniversitat Hamburg
Deposit date
11 Apr 2018 07:30
Last modified
07 Nov 2018 22:00
Project name
MAGCOW - The Magnetised Cosmic Web
Funding program
EC - H2020

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