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Detection of magnet...
Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation
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- Heesen, V. (author)
- Universität Hamburg,University of Hamburg
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- O'Sullivan, Shane P. (author)
- Dublin City University
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- Brüggen, M. (author)
- Universität Hamburg,University of Hamburg
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- Basu, A. (author)
- Thüringer Landessternwarte Tautenburg
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- Beck, R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Seta, A. (author)
- Australian National University
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- Carretti, E. (author)
- Istituto nazionale di astrofisica (INAF)
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- Krause, M. G.H. (author)
- University of Hertfordshire
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- Haverkorn, M. (author)
- Radboud Universiteit,Radboud University
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- Hutschenreuter, S. (author)
- Radboud Universiteit,Radboud University
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Bracco, Andrea (author)
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- Stein, M. (author)
- Ruhr-Universität Bochum
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- Bomans, D. (author)
- Ruhr-Universität Bochum
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- Dettmar, R. -J. (author)
- Ruhr-Universität Bochum
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- Chyz̊y, K.T. (author)
- Jagiellonian University in Kraków, Poland
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- Heald, G. (author)
- Commonwealth Scientific and Industrial Research Organisation (CSIRO)
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- Paladino, R. (author)
- Istituto nazionale di astrofisica (INAF)
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- Horellou, Cathy, 1967 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2023-02-24
- 2023
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 670
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https://research.cha...
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https://doi.org/10.1...
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Abstract
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- Context. The existence of magnetic fields in the circumgalactic medium (CGM) is largely unconstrained. Their detection is important as magnetic fields can have a significant impact on the evolution of the CGM, and, in turn, the fields can serve as tracers for dynamical processes in the CGM. Aims. Using the Faraday rotation of polarised background sources, we aim to detect a possible excess of the rotation measure in the surrounding area of nearby galaxies. Methods. We used 2461 residual rotation measures (RRMs) observed with the LOw Frequency ARray (LOFAR), where the foreground contribution from the Milky Way is subtracted. The RRMs were then studied around a subset of 183 nearby galaxies that was selected by apparent B-band magnitude. Results. We find that, in general, the RRMs show no significant excess for small impact parameters (i.e., the perpendicular distance to the line of sight). However, if we only consider galaxies at higher inclination angles and sightlines that pass close to the minor axis of the galaxies, we find significant excess at impact parameters of less than 100 kpc. The excess in |RRM| is 3.7 rad m-2 with an uncertainty between ±0.9 rad m-2 and ±1.3 rad m-2 depending on the statistical properties of the background (2.8σ - 4.1σ). With electron densities of ∼10-4 cm-3, this suggests magnetic field strengths of a few tenths of a microgauss. Conclusions. Our results suggest a slow decrease in the magnetic field strength with distance from the galactic disc, as expected if the CGM is magnetised by galactic winds and outflows.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Galaxies: fundamental parameters
- Galaxies: ISM
- Galaxies: magnetic fields
- Radio continuum: galaxies
- Cosmic rays
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Heesen, V.
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O'Sullivan, Shan ...
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Brüggen, M.
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Basu, A.
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Beck, R.
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Seta, A.
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show more...
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Carretti, E.
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Krause, M. G.H.
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Haverkorn, M.
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Hutschenreuter, ...
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Bracco, Andrea
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Stein, M.
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Bomans, D.
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Dettmar, R. -J.
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Chyz̊y, K.T.
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Heald, G.
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Paladino, R.
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Horellou, Cathy, ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Astronomy and As ...
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Chalmers University of Technology