Distant probes of rotation measure structure: where is the Faraday rotation towards the Magellanic Leading Arm?

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dc.contributor.authorJung, Seoyoung Lyla
dc.contributor.authorMcClure-Griffiths, Naomi
dc.contributor.authorHill, Alex S.
dc.date.accessioned2024-03-22T00:04:41Z
dc.date.available2024-03-22T00:04:41Z
dc.date.issued2021
dc.date.updated2022-11-13T07:17:20Z
dc.description.abstractFaraday rotation measures (RMs) should be interpreted with caution because there could be multiple magneto-ionized medium components that contribute to the net Faraday rotation along sightlines. We introduce a simple test using Galactic diffuse polarized emission that evaluates whether structures evident in RM observations are associated with distant circumgalactic medium or foreground interstellar medium. We focus on the Magellanic Leading Arm region where a clear excess of RM was previously reported. There are two gaseous objects standing out in this direction: the distant Magellanic Leading Arm and the nearby Antlia supernova remnant (SNR). We recognized narrow depolarized filaments in the 2.3GHz S-band Polarization All Sky Survey image that overlaps with the reported RM excess. We suggest that there is a steep gradient in Faraday rotation in a foreground screen arising from the Antlia SNR. The estimated strength of the line-of-sight component of the magnetic field is B ∼5 μG, assuming that the excess of RM is entirely an outcome of the magnetized supernova shell. Our analysis indicates that the overlap between the RM excess and the Magellanic Leading Arm is only a remarkable coincidence. We suggest for future RM grid studies that checking Galactic diffuse polarization maps is a convenient way to identify local Faraday screens.en_AU
dc.description.sponsorshipNMG acknowledges the support of the ARC through Future Fellowship FT150100024. ASH is partly supported by a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0035-8711en_AU
dc.identifier.urihttp://hdl.handle.net/1885/316214
dc.language.isoen_AUen_AU
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."The Published Version can be archived in an Institutional Repository" from SHERPA/RoMEO site (as at 19/03/2024). This article has been accepted for publication in [Monthly Notices of the Royal Astronomical Society] ©: 2021 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.en_AU
dc.publisherOxford University Pressen_AU
dc.relationhttp://purl.org/au-research/grants/arc/FT150100024en_AU
dc.rights© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Societyen_AU
dc.sourceMonthly Notices of the Royal Astronomical Societyen_AU
dc.titleDistant probes of rotation measure structure: where is the Faraday rotation towards the Magellanic Leading Arm?en_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue3en_AU
local.bibliographicCitation.lastpage3935en_AU
local.bibliographicCitation.startpage3921en_AU
local.contributor.affiliationJung, Seoyoung Lyla, OTH Other Departments, ANUen_AU
local.contributor.affiliationMcClure-Griffiths, Naomi, College of Science, ANUen_AU
local.contributor.affiliationHill, Alex S., The University of British Columbiaen_AU
local.contributor.authoremailu1000518@anu.edu.auen_AU
local.contributor.authoruidJung, Seoyoung Lyla, u7012305en_AU
local.contributor.authoruidMcClure-Griffiths, Naomi, u1000518en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor510100 - Astronomical sciencesen_AU
local.identifier.absseo280120 - Expanding knowledge in the physical sciencesen_AU
local.identifier.ariespublicationa383154xPUB23462en_AU
local.identifier.citationvolume508en_AU
local.identifier.doi10.1093/mnras/stab2773en_AU
local.identifier.scopusID2-s2.0-85119500956
local.identifier.uidSubmittedBya383154en_AU
local.publisher.urlhttps://academic.oup.com/mnrasen_AU
local.type.statusPublished Versionen_AU

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