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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33971
Title: Magnetic field evolution in cosmic filaments with LOFAR data
Authors: CARRETTI, ETTORE 
O'Sullivan, S.
VACCA, VALENTINA 
VAZZA, FRANCO 
Gheller, C.
Vernstrom, T.
BONAFEDE, Annalisa 
Issue Date: 2023
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 518
Issue: 2
First Page: 2273
Abstract: Measuring the magnetic field in cosmic filaments reveals how the Universe is magnetised and the process that magnetised it. Using the Rotation Measures (RM) at 144-MHz from the LoTSS DR2 data, we analyse the rms of the RM extragalactic component as a function of redshift to investigate the evolution with redshift of the magnetic field in filaments. From previous results, we find that the extragalactic term of the RM rms at 144-MHz is dominated by the contribution from filaments (more than 90 percent). Including an error term to account for the minor contribution local to the sources, we fit the data with a model of the physical filament magnetic field, evolving as $B_f = B_{f,0}\,(1+z)^\alpha$ and with a density drawn from cosmological simulations of five magnetogenesis scenarios. We find that the best-fit slope is in the range $\alpha = [-0.2, 0.1]$ with uncertainty of $\sigma_\alpha = 0.4$--0.5, which is consistent with no evolution. The comoving field decreases with redshift with a slope of $\gamma = \alpha - 2 = [-2.2, -1.9]$. The mean field strength at $z=0$ is in the range $B_{f,0}=39$--84~nG. For a typical filament gas overdensity of $\delta_g=10$ the filament field strength at $z=0$ is in the range $B_{f,0}^{10}=8$--26~nG. A primordial stochastic magnetic field model with initial comoving field of $B_{\rm Mpc} = 0.04$--0.11~nG is favoured. The primordial uniform field model is rejected.
URI: http://hdl.handle.net/20.500.12386/33971
URL: http://arxiv.org/abs/2210.06220
https://academic.oup.com/mnras/article/518/2/2273/6762929
ISSN: 0035-8711
DOI: 10.1093/mnras/stac2966
Bibcode ADS: 2023MNRAS.518.2273C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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