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dc.contributor.authorMoran, Paul
dc.contributor.authorKyne, Gillian
dc.contributor.authorRedfern, R. M.
dc.contributor.authorShearer, Andrew
dc.date.accessioned2016-05-13T08:50:17Z
dc.date.available2016-05-13T08:50:17Z
dc.date.issued2015-12-31
dc.identifier.citationMoran, P.; Kyne, G.; Gouiffès, C.; Laurent, P.; Hallinan, G.; Redfern, R. M.; Shearer, A. (2016) 'A recent change in the optical and gamma ray polarization of the Crab nebula and pulsar'. Monthly Notices Of The Royal Astronomical Society, 456 :2974-2981.en_IE
dc.identifier.issn1365-2966
dc.identifier.urihttp://hdl.handle.net/10379/5785
dc.descriptionJournal articleen_IE
dc.description.abstractWe report on observations of the polarization of optical and γ-ray photons from the Crab nebula and pulsar system using the Galway Astronomical Stokes Polarimeter (GASP), the Hubble Space Telescope, Advanced Camera for Surveys and the International Gamma-Ray Astrophysics Laboratory satellite (INTEGRAL). These, when combined with other optical polarization observations, suggest that the polarized optical emission and γ-ray polarization changes in a similar manner. A change in the optical polarization angle has been observed by this work, from 109.5 ± 0 ∘ . .∘ 7 in 2005 to 85.3 ± 1 ∘ . .∘ 4 in 2012. On the other hand, the γ-ray polarization angle changed from 115 ± 11° in 2003–2007 to 80 ± 12° in 2012–2014. Strong flaring activities have been detected in the Crab nebula over the past few years by the high-energy γ-ray missions Agile and Fermi, and magnetic reconnection processes have been suggested to explain these observations. The change in the polarized optical and γ-ray emission of the Crab nebula/pulsar as observed, for the first time, by GASP and INTEGRAL may indicate that reconnection is possibly at work in the Crab nebula. We also report, for the first time, a non-zero measure of the optical circular polarization from the Crab pulsar+knot system.en_IE
dc.description.sponsorshipSTScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Science Foundation Ireland is acknowledged for its support in the development of GASP under grant number 09/RFP/AST2391. PM thanks the Irish Research Council for support. This work was made possible in part through support of the Ulysses Ireland–France collaborative funding research programme.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherOxford journalsen_IE
dc.relation.ispartofMonthly Notices Of The Royal Astronomical Societyen
dc.subjectPolarizationen_IE
dc.subjectRadiation mechanisms: non-thermalen_IE
dc.subjectStars: neutronen_IE
dc.subjectPulsars: individual: the Crab pulsaren_IE
dc.titleA recent change in the optical and gamma ray polarization of the Crab nebula and pulsaren_IE
dc.typeArticleen_IE
dc.date.updated2016-05-10T12:59:57Z
dc.identifier.doi10.1093/mnras/stv2780
dc.local.publishedsourcehttp://dx.doi.org/10.1093/mnras/stv2780en_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funderScience Foundation Ireland is acknowledged for its support in the development of GASP under grant number 09/RFP/AST2391. PM thanks the Irish Research Council for support. This work was made possible in part through support of the Ulysses Ireland–France collaborative funding research programme.
dc.internal.rssid10969115
dc.local.contactAndrew Shearer, School Of Physics, Room 143, Arts/Science Building, Nui Galway. 3114 Email: andy.shearer@nuigalway.ie
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