The Polarisation of the Drifting Sub-Pulses From PSR B1919+21

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aut.relation.journalAstronomy and Astrophysicsen_NZ
aut.relation.volume657en_NZ
aut.researcherGulyaev, Sergei
dc.contributor.authorPrimak, Nen_NZ
dc.contributor.authorTiburzi, Cen_NZ
dc.contributor.authorVan Straten, Wen_NZ
dc.contributor.authorDyks, Jen_NZ
dc.contributor.authorGulyaev, Sen_NZ
dc.date.accessioned2022-06-20T23:22:12Z
dc.date.available2022-06-20T23:22:12Z
dc.date.copyright2022en_NZ
dc.date.issued2022en_NZ
dc.description.abstractAims. We aim to expand our understanding of radio wave emission and propagation in the pulsar magnetosphere by studying the polarisation of drifting sub-pulses in highly sensitive observations of PSR B1919+21 recorded at the Arecibo Observatory. Methods. We apply and compare several methods of analysis and visualisation, including eigenvalue analysis of the longitude-resolved covariances between the Stokes parameters; longitude-resolved scatter plots of the normalised Stokes vectors in the Poincaré sphere; auto- and cross-correlations between the Stokes parameters as a function of offset in pulse longitude and lag in pulse number; and mean drift bands of polarisation state, formed by averaging the Stokes parameters and quantities derived from them synchronously with the drifting sub-pulse modulation period. Results. We observe regions of pulse longitude where the superposition of orthogonally polarised modes is best described as incoherent and regions where the superposition appears to be at least partially coherent. Within the region of coherent superposition, over a range of pulse longitudes spanning ∼2°, the distribution of the Stokes polarisation vectors forms a torus centered near the origin of the Poincaré sphere. Furthermore, the polarisation vectors rotate about the axis of revolution of the torus synchronously with the drifting sub-pulse modulation of the total intensity. Conclusions. The nearly uniform circular modulation of polarisation state, clearly evident in both the toroidal distribution of the Stokes polarisation vectors and the mean drift bands of the Stokes parameters, is not predicted by current theoretical models of pulsar emission. We propose different scenarios to explain the generation of the torus, based on either incoherent or phase-coherent superposition of orthogonally polarised modes.en_NZ
dc.identifier.citationAstronomy and Astrophysics, 657, A34 (2022), https://doi.org/10.1051/0004-6361/202140811
dc.identifier.doi10.1051/0004-6361/202140811en_NZ
dc.identifier.issn0004-6361en_NZ
dc.identifier.issn1432-0746en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/15246
dc.publisherEDP Sciences
dc.relation.urihttps://www.aanda.org/articles/aa/full_html/2022/01/aa40811-21/aa40811-21.html
dc.rights(C) ESO 2022. The A&A board of directors and EDP Sciences are pleased to announce that A&A has now received the required level of support and will be published open access in 2022 under the terms of this transformative model. From 4th of April 2022, newly accepted A&A articles will publish under a CC-BY 4.0 license allowing authors to retain the copyright and others to share and adapt the content. Content already published or accepted before the 4th of April will be released in free access (freely accessible to all, but not under a CC-BY license).
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectPolarization / pulsars; Individual; PSR B1919+21
dc.titleThe Polarisation of the Drifting Sub-Pulses From PSR B1919+21en_NZ
dc.typeJournal Article
pubs.elements-id447790
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Faculty of Design & Creative Technologies
pubs.organisational-data/AUT/PBRF
pubs.organisational-data/AUT/PBRF/PBRF Design and Creative Technologies
pubs.organisational-data/AUT/PBRF/PBRF Design and Creative Technologies/PBRF ECMS
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