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  New constraints on the magnetic field in cosmic web filaments

Locatelli, N., Vazza, F., Bonafede, A., Banfi, S., Bernardi, G., Gheller, C., et al. (2021). New constraints on the magnetic field in cosmic web filaments. Astronomy and Astrophysics, 652: A80. doi:10.1051/0004-6361/202140526.

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Locatelli, N.1, Author              
Vazza, F., Author
Bonafede, A., Author
Banfi, S., Author
Bernardi, G., Author
Gheller, C., Author
Botteon, A., Author
Shimwell, T., Author
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Strong accretion shocks are expected to illuminate the warm–hot intergalactic medium encompassed by the filaments of the cosmic web, through synchrotron radio emission. Given their high sensitivity, large low-frequency radio facilities may already be able to detect signatures of this extended radio emission from the region between two close and massive galaxy clusters. In this work we exploit the non-detection of such diffuse emission by deep observations of two pairs of relatively close (≃10 Mpc) and massive (M500 ≥ 1014 M) galaxy clusters using the LOw-Frequency ARray. By combining the results from the two putative inter-cluster filaments, we derive new independent constraints on the median strength of intergalactic magnetic fields: B10 Mpc < 2.5 × 102 nG (95% confidence level). Based on cosmological simulations and assuming a primordial origin of the B-fields, these estimates can be used to limit the amplitude of primordial seed magnetic fields: B0 ≤ 10 nG. We recommend the observation of similar cluster pairs as a powerful tool to set tight constraints on the amplitude of extragalactic magnetic fields.

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 Dates: 2021-08-13
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/202140526
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 652 Sequence Number: A80 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1