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

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

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

Shimwell, T. W. (author): Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL)

Hardcastle, M. J. (author): University of Hertfordshire

Tasse, C. (author): Rhodes University,PSL University Paris

Heald, G. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Carretti, E. (author): Istituto nazionale di astrofisica (INAF)

Bruggen, M. (author): Universität Hamburg,University of Hamburg

Vacca, V. (author): Istituto nazionale di astrofisica (INAF)

Sobey, C. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Van Eck, C. L. (author): University of Toronto

Horellou, Cathy, 1967 (author): Chalmers tekniska högskola,Chalmers University of Technology

Beck, R. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Bilicki, M. (author): Polish Academy of Sciences

Bourke, Stephen, 1978 (author): Chalmers tekniska högskola,Chalmers University of Technology

Botteon, A. (author): Universiteit Leiden (UL),Leiden University (UL)

Croston, J. H. (author): Open University

Drabent, A. (author): Thüringer Landessternwarte Tautenburg

Duncan, K. (author): Royal Observatory

Heesen, V (author): Universität Hamburg,University of Hamburg

Ideguchi, S. (author): National Astronomical Observatory of Japan

Kirwan, M. (author): Dublin City University

Lawlor, L. (author): Dublin City University

Mingo, B. (author): Open University

Nikiel-Wroczynski, B. (author): Jagiellonian University in Kraków, Poland

Piotrowska, J. (author): Jagiellonian University in Kraków, Poland

Scaife, A. M. M. (author): The Alan Turing Institute,University of Manchester

van Weeren, R. J. (author): Universiteit Leiden (UL),Leiden University (UL)

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2023-01-02
2023
English.
In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 519:4, s. 5723-5742

Related links:: https://research.cha... (primary) (free); show more...; https://doi.org/10.1...; https://research.cha...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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

NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)

Keyword

radio continuum: galaxies
magnetic fields
catalogues
techniques: polarimetric
polarization
galaxies: active

Publication and Content Type

art (subject category)
ref (subject category)

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Accelerator Phys ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

Articles in the publication: Monthly Notices ...

By the university: Chalmers University of Technology

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