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dc.contributor.authorO’Sullivan, S P
dc.contributor.authorBrüggen, M
dc.contributor.authorVazza, F
dc.contributor.authorCarretti, E
dc.contributor.authorT Locatelli, N
dc.contributor.authorStuardi, C
dc.contributor.authorVacca, V
dc.contributor.authorVernstrom, T
dc.contributor.authorHeald, G
dc.contributor.authorHorellou, C
dc.contributor.authorW Shimwell, T
dc.contributor.authorHardcastle, Martin
dc.contributor.authorTasse, C
dc.contributor.authorRöttgering, H
dc.date.accessioned2021-07-21T09:43:22Z
dc.date.available2021-07-21T09:43:22Z
dc.date.issued2020-07-01
dc.identifier.citationO’Sullivan , S P , Brüggen , M , Vazza , F , Carretti , E , T Locatelli , N , Stuardi , C , Vacca , V , Vernstrom , T , Heald , G , Horellou , C , W Shimwell , T , Hardcastle , M , Tasse , C & Röttgering , H 2020 , ' New constraints on the magnetization of the cosmic web using LOFAR Faraday rotation observations ' , Monthly Notices of the Royal Astronomical Society , vol. 495 , no. 3 , pp. 2607–2619 . https://doi.org/10.1093/mnras/staa1395
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 25536440
dc.identifier.otherPURE UUID: 647f29c9-cecf-4d46-a574-f0cb6ff842b4
dc.identifier.otherScopus: 85091974583
dc.identifier.urihttp://hdl.handle.net/2299/24890
dc.description© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
dc.description.abstractMeasuring the properties of extragalactic magnetic fields through the effect of Faraday rotation provides a means to understand the origin and evolution of cosmic magnetism. Here, we use data from the LOFAR Two-Metre Sky Survey (LoTSS) to calculate the Faraday rotation measure (RM) of close pairs of extragalactic radio sources. By considering the RM difference (ΔRM) between physical pairs (e.g. double-lobed radio galaxies) and non-physical pairs (i.e. close projected sources on the sky), we statistically isolate the contribution of extragalactic magnetic fields to ΔRM along the line of sight between non-physical pairs. From our analysis, we find no significant difference between the ΔRM distributions of the physical and non-physical pairs, limiting the excess Faraday rotation contribution to <1.9 rad m−2 (⁠∼95 per cent confidence). We use this limit with a simple model of an inhomogeneous universe to place an upper limit of 4 nG on the cosmological co-moving magnetic field strength on Mpc scales. We also compare the RM data with a more realistic suite of cosmological magnetohydrodynamical simulations that explore different magnetogenesis scenarios. Both magnetization of the large-scale structure by astrophysical processes such as galactic and AGN outflows, and simple primordial scenarios with seed magnetic field strengths <0.5 nG cannot be rejected by the current data; while stronger primordial fields or models with dynamo amplification in filaments are disfavoured.en
dc.format.extent13
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.titleNew constraints on the magnetization of the cosmic web using LOFAR Faraday rotation observationsen
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2020-07-01
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/staa1395
rioxxterms.licenseref.uriUnspecified
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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