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Intergalactic Medium Rotation Measure of Primordial Magnetic Fields
Dipartimento di Fisica e Astronomia, Universitá di Bologna, Via Gobetti 92/3, 40121, Bologna, Italy;, Via Gobetti 92/3; School of Natural Sciences and Medicine, Ilia State University, 3-5 Cholokashvili Street, 0194 Tbilisi, Georgia, 3-5 Cholokashvili Street.
Dipartimento di Fisica e Astronomia, Universitá di Bologna, Via Gobetti 92/3, 40121, Bologna, Italy;, Via Gobetti 92/3; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA, 60 Garden Street; INAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, via Gobetti 93/3, 40129 Bologna, Italy, via Gobetti 93/3.
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA.
INAF—Istituto di Radioastronomia, Via Gobetti 101, 40129 Bologna, Italy, Via Gobetti 101.
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2024 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 977, no 1, article id 128Article in journal (Refereed) Published
Abstract [en]

The Faraday rotation effect, quantified by the rotation measure (RM), is a powerful probe of the large-scale magnetization of the Universe—tracing magnetic fields not only on galaxy and galaxy cluster scales but also in the intergalactic medium (IGM; referred to as RMIGM). The redshift dependence of the latter has extensively been explored with observations. It has also been shown that this relation can help to distinguish between different large-scale magnetization scenarios. We study the evolution of this RMIGM for different primordial magnetogenesis scenarios to search for the imprints of primordial magnetic fields (PMFs; magnetic fields originating in the early Universe) on the redshift-dependence of RMIGM. We use cosmological magnetohydrodynamic simulations for evolving PMFs during large-scale structure formation, coupled with the light-cone analysis to produce a realistic statistical sample of mock RMIGM images. We study the predicted behavior for the cosmic evolution of RMIGM for different correlation lengths of PMFs, and provide fitting functions for their dependence on redshifts. We compare these mock RM trends with the recent analysis of the the LOw-Frequency ARray RM Grid and find that large-scale-correlated PMFs should have (comoving) strengths ≲0.75 nG, if they originated during inflation with the scale-invariant spectrum and (comoving) correlation length of ∼19 h −1 cMpc or ≲30 nG if they originated during phase-transition epochs with the comoving correlation length of ∼1 h −1 cMpc. Our findings agree with previous observations and confirm the results of semi-analytical studies, showing that upper limits on the PMF strength decrease as their coherence scales increase.

Place, publisher, year, edition, pages
American Astronomical Society , 2024. Vol. 977, no 1, article id 128
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:kth:diva-358167DOI: 10.3847/1538-4357/ad8dc5ISI: 001372775400001Scopus ID: 2-s2.0-85212124340OAI: oai:DiVA.org:kth-358167DiVA, id: diva2:1924794
Note

QC 20250120

Available from: 2025-01-07 Created: 2025-01-07 Last updated: 2025-01-20Bibliographically approved

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Brandenburg, Axel

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