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Search: WFRF:(Kirwan M. L.) > (2020-2023) > The Faraday Rotatio...

  • O'Sullivan, S. P.Dublin City University (author)

The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023-01-02
  • Oxford University Press (OUP),2023
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:9a4d03c4-e19c-4d4f-8579-7fff631afdb6
  • https://doi.org/10.1093/mnras/stac3820DOI
  • https://research.chalmers.se/publication/534975URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • A 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 similar to 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 arcsec 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 similar to 0.2 percent. 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 radm(-2) is possible, after the ionosphere RM correction). The median degree of polarization of the detected sources is 1.8 percent, with a range of 0.05 percent to 31 percent. 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 percent of the sources, along with redshifts for 79 percent (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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Shimwell, T. W.Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL) (author)
  • Hardcastle, M. J.University of Hertfordshire (author)
  • Tasse, C.Rhodes University,PSL University Paris (author)
  • Heald, G.Commonwealth Scientific and Industrial Research Organisation (CSIRO) (author)
  • Carretti, E.Istituto nazionale di astrofisica (INAF) (author)
  • Bruggen, M.Universität Hamburg,University of Hamburg (author)
  • Vacca, V.Istituto nazionale di astrofisica (INAF) (author)
  • Sobey, C.Commonwealth Scientific and Industrial Research Organisation (CSIRO) (author)
  • Van Eck, C. L.University of Toronto (author)
  • Horellou, Cathy,1967Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)horellou (author)
  • Beck, R.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Bilicki, M.Polish Academy of Sciences (author)
  • Bourke, Stephen,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bourke (author)
  • Botteon, A.Universiteit Leiden (UL),Leiden University (UL) (author)
  • Croston, J. H.Open University (author)
  • Drabent, A.Thüringer Landessternwarte Tautenburg (author)
  • Duncan, K.Royal Observatory (author)
  • Heesen, VUniversität Hamburg,University of Hamburg (author)
  • Ideguchi, S.National Astronomical Observatory of Japan (author)
  • Kirwan, M.Dublin City University (author)
  • Lawlor, L.Dublin City University (author)
  • Mingo, B.Open University (author)
  • Nikiel-Wroczynski, B.Jagiellonian University in Kraków, Poland (author)
  • Piotrowska, J.Jagiellonian University in Kraków, Poland (author)
  • Scaife, A. M. M.The Alan Turing Institute,University of Manchester (author)
  • van Weeren, R. J.Universiteit Leiden (UL),Leiden University (UL) (author)
  • Dublin City UniversityNetherlands Institute for Radio Astronomy (ASTRON) (creator_code:org_t)

Related titles

  • In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)519:4, s. 5723-57420035-87111365-2966

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