dc.contributor.author | Heesen, V. | |
dc.contributor.author | O'Sullivan, S. P. | |
dc.contributor.author | Brüggen, M. | |
dc.contributor.author | Basu, A. | |
dc.contributor.author | Beck, R. | |
dc.contributor.author | Seta, A. | |
dc.contributor.author | Carretti, E. | |
dc.contributor.author | Krause, M. G. H. | |
dc.contributor.author | Haverkorn, M. | |
dc.contributor.author | Hutschenreuter, S. | |
dc.contributor.author | Bracco, A. | |
dc.contributor.author | Stein, M. | |
dc.contributor.author | Bomans, D. J. | |
dc.contributor.author | Dettmar, R. -J. | |
dc.contributor.author | Chyży, K. T. | |
dc.contributor.author | Heald, G. H. | |
dc.contributor.author | Paladino, R. | |
dc.contributor.author | Horellou, C. | |
dc.date.accessioned | 2023-04-12T10:30:04Z | |
dc.date.available | 2023-04-12T10:30:04Z | |
dc.date.issued | 2023-02-24 | |
dc.identifier.citation | Heesen , V , O'Sullivan , S P , Brüggen , M , Basu , A , Beck , R , Seta , A , Carretti , E , Krause , M G H , Haverkorn , M , Hutschenreuter , S , Bracco , A , Stein , M , Bomans , D J , Dettmar , R -J , Chyży , K T , Heald , G H , Paladino , R & Horellou , C 2023 , ' Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation ' , Astronomy & Astrophysics , vol. 670 , L23 . https://doi.org/10.1051/0004-6361/202346008 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2302.06617v1 | |
dc.identifier.other | ORCID: /0000-0002-9610-5629/work/133139509 | |
dc.identifier.uri | http://hdl.handle.net/2299/26160 | |
dc.description | © The Authors 2023. This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). | |
dc.description.abstract | 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. | en |
dc.format.extent | 5 | |
dc.format.extent | 385161 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | astro-ph.GA | |
dc.subject | Galaxies: fundamental parameters | |
dc.subject | Radio continuum: galaxies | |
dc.subject | Galaxies: ISM | |
dc.subject | Galaxies: magnetic fields | |
dc.subject | Cosmic rays | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | Detection of magnetic fields in the circumgalactic medium of nearby galaxies using Faraday rotation | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85149385854&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1051/0004-6361/202346008 | |
rioxxterms.type | Other | |
herts.preservation.rarelyaccessed | true | |