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dc.contributor.authorO'Sullivan, S. P.
dc.contributor.authorShimwell, T. W.
dc.contributor.authorHardcastle, M. J.
dc.contributor.authorTasse, C.
dc.contributor.authorHeald, G.
dc.contributor.authorCarretti, E.
dc.contributor.authorBrüggen, M.
dc.contributor.authorVacca, V.
dc.contributor.authorSobey, C.
dc.contributor.authorEck, C. L. Van
dc.contributor.authorHorellou, C.
dc.contributor.authorBeck, R.
dc.contributor.authorBilicki, M.
dc.contributor.authorBourke, S.
dc.contributor.authorBotteon, A.
dc.contributor.authorCroston, J. H.
dc.contributor.authorDrabent, A.
dc.contributor.authorDuncan, K.
dc.contributor.authorHeesen, V.
dc.contributor.authorIdeguchi, S.
dc.contributor.authorKirwan, M.
dc.contributor.authorLawlor, L.
dc.contributor.authorMingo, B.
dc.contributor.authorNikiel-Wroczyński, B.
dc.contributor.authorPiotrowska, J.
dc.contributor.authorScaife, A. M. M.
dc.contributor.authorWeeren, R. J. van
dc.date.accessioned2023-02-01T12:15:01Z
dc.date.available2023-02-01T12:15:01Z
dc.date.issued2023-01-02
dc.identifier.citationO'Sullivan , S P , Shimwell , T W , Hardcastle , M J , Tasse , C , Heald , G , Carretti , E , Brüggen , M , Vacca , V , Sobey , C , Eck , C L V , Horellou , C , Beck , R , Bilicki , M , Bourke , S , Botteon , A , Croston , J H , Drabent , A , Duncan , K , Heesen , V , Ideguchi , S , Kirwan , M , Lawlor , L , Mingo , B , Nikiel-Wroczyński , B , Piotrowska , J , Scaife , A M M & Weeren , R J V 2023 , ' The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2 ' , Monthly Notices of the Royal Astronomical Society , vol. 519 , no. 4 . https://doi.org/10.1093/mnras/stac3820
dc.identifier.issn0035-8711
dc.identifier.otherArXiv: http://arxiv.org/abs/2301.07697v1
dc.identifier.urihttp://hdl.handle.net/2299/26032
dc.description© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1093/mnras/stac3820
dc.description.abstractA Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Survey (LoTSS), we have produced a catalogue of 2461 extragalactic high-precision RM values across 5720 deg$^{2}$ of sky (corresponding to a polarized source areal number density of $\sim$0.43 deg$^{-2}$). The linear polarization and RM properties were derived using RM synthesis from the Stokes $Q$ and $U$ channel images at an angular resolution of 20'' across a frequency range of 120 to 168 MHz with a channel bandwidth of 97.6 kHz. The fraction of total intensity sources ($>1$ mJy beam$^{-1}$) found to be polarized was $\sim$0.2%. The median detection threshold was 0.6 mJy beam$^{-1}$ ($8\sigma_{QU}$), with a median RM uncertainty of 0.06 rad m$^{-2}$ (although a systematic uncertainty of up to 0.3 rad m$^{-2}$ is possible, after the ionosphere RM correction). The median degree of polarization of the detected sources is 1.8%, with a range of 0.05% to 31%. Comparisons with cm-wavelength RMs indicate minimal amounts of Faraday complexity in the LoTSS detections, making them ideal sources for RM Grid studies. Host galaxy identifications were obtained for 88% of the sources, along with redshifts for 79% (both photometric and spectroscopic), with the median redshift being 0.6. The focus of the current catalogue was on reliability rather than completeness, and we expect future versions of the LoTSS RM Grid to have a higher areal number density. In addition, 25 pulsars were identified, mainly through their high degrees of linear polarization.en
dc.format.extent20
dc.format.extent2494226
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.CO
dc.subjectastro-ph.GA
dc.titleThe Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2en
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSPECS Deans Group
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.1093/mnras/stac3820
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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