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Inflationary and Phase-transitional Primordial Magnetic Fields in Galaxy Clusters
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Number of Authors: 72023 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 944, no 1, article id 100Article in journal (Refereed) Published
Abstract [en]

Primordial magnetic fields (PMFs) are possible candidates for explaining the observed magnetic fields in galaxy clusters. Two competing scenarios of primordial magnetogenesis have been discussed in the literature: inflationary and phase-transitional. We study the amplification of both large- and small-scale correlated magnetic fields, corresponding to inflation- and phase transition–generated PMFs, in a massive galaxy cluster. We employ high-resolution magnetohydrodynamic cosmological zoom-in simulations to resolve the turbulent motions in the intracluster medium. We find that the turbulent amplification is more efficient for the large-scale inflationary models, while the phase transition–generated seed fields show moderate growth. The differences between the models are imprinted on the spectral characteristics of the field (such as the amplitude and the shape of the magnetic power spectrum) and therefore also on the final correlation length. We find a one order of magnitude difference between the final strengths of the inflation- and phase transition–generated magnetic fields, and a factor of 1.5 difference between their final coherence scales. Thus, the final configuration of the magnetic field retains information about the PMF generation scenarios. Our findings have implications for future extragalactic Faraday rotation surveys with the possibility of distinguishing between different magnetogenesis scenarios.

Place, publisher, year, edition, pages
2023. Vol. 944, no 1, article id 100
Keywords [en]
Magnetohydrodynamical simulations, Galaxy clusters, Primordial magnetic fields, Intracluster medium
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-215791DOI: 10.3847/1538-4357/acb04dISI: 000936676700001Scopus ID: 2-s2.0-85148454827OAI: oai:DiVA.org:su-215791DiVA, id: diva2:1747500
Available from: 2023-03-30 Created: 2023-03-30 Last updated: 2023-03-30Bibliographically approved

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Brandenburg, Axel

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Nordic Institute for Theoretical Physics (Nordita)Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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