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dc.contributor.authorO'Sullivan, Shane P.
dc.contributor.authorBrüggen, M.
dc.contributor.authorEck, C. L. Van
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorHaverkorn, M.
dc.contributor.authorShimwell, T. W.
dc.contributor.authorTasse, C.
dc.contributor.authorVacca, V.
dc.contributor.authorHorellou, C.
dc.contributor.authorHeald, G.
dc.date.accessioned2018-12-07T02:10:31Z
dc.date.available2018-12-07T02:10:31Z
dc.date.issued2018-11-29
dc.identifier.citationO'Sullivan , S P , Brüggen , M , Eck , C L V , Hardcastle , M J , Haverkorn , M , Shimwell , T W , Tasse , C , Vacca , V , Horellou , C & Heald , G 2018 , ' Untangling cosmic magnetic fields: Faraday tomography at metre wavelengths with LOFAR ' , Galaxies , vol. 6 , no. 4 , 126 . https://doi.org/10.3390/galaxies6040126
dc.identifier.issn2075-4434
dc.identifier.otherPURE: 15793398
dc.identifier.otherPURE UUID: e37c45b1-0a60-4706-b269-66b203bb1858
dc.identifier.otherArXiv: http://arxiv.org/abs/1811.12732v1
dc.identifier.otherScopus: 85059404999
dc.identifier.urihttp://hdl.handle.net/2299/20835
dc.description14 pages, 6 figures. Accepted for publication in "The Power of Faraday Tomography" special issue of Galaxies
dc.description.abstractThe technique of Faraday tomography is a key tool for the study ofmagnetised plasmas in the new era of broadband radio-polarisation observations. In particular, observations at metre wavelengths provide significantly better Faraday depth accuracies compared to traditional centimetre-wavelength observations. However, the effect of Faraday depolarisationmakes the polarised signal very challenging to detect at metre wavelengths (MHz frequencies). In this work, Faraday tomography is used to characterise the Faraday rotation properties of polarised sources found in data from the LOFAR Two-Metre Sky Survey (LoTSS). Of the 76 extragalactic polarised sources analysed here, we find that all host a radio-loud AGN (Active Galactic Nucleus). The majority of the sources (~64%) are large FRII radio galaxies with a median projected linear size of 710 kpc and median radio luminosity at 144 MHz of 4 × 10 26 W Hz -1 (with ~13% of all sources having a linear size > 1 Mpc). In several cases, both hotspots are detected in polarisation at an angular resolution of ~20'. One such case allowed a study of intergalactic magnetic fields on scales of 3.4 Mpc. Other detected source types include an FRI radio galaxy and at least eight blazars. Most sources display simple Faraday spectra, but we highlight one blazar that displays a complex Faraday spectrum, with two close peaks in the Faraday dispersion function.en
dc.language.isoeng
dc.relation.ispartofGalaxies
dc.subjectAGN
dc.subjectFaraday tomography
dc.subjectLarge-scale structure
dc.subjectMagnetic fields
dc.subjectMilky Way
dc.subjectAstronomy and Astrophysics
dc.titleUntangling cosmic magnetic fields: Faraday tomography at metre wavelengths with LOFARen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85059404999&partnerID=8YFLogxK
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3390/galaxies6040126
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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