Variability and stability in blazar jets on time-scales of years: optical polarization monitoring of OJ 287 in 2005-2009

dc.contributor.authorVillforth, C.
dc.contributor.authorNilsson, K.
dc.contributor.authorHeidt, J.
dc.contributor.authorTakalo, L. O.
dc.contributor.authorPursimo, T.
dc.contributor.authorBerdyugin, A.
dc.contributor.authorLindfors, E.
dc.contributor.authorPasanen, M.
dc.contributor.authorWiniarski, M.
dc.contributor.authorDrozdz, M.
dc.contributor.authorOgloza, W.
dc.contributor.authorKurpinska-Winiarska, M.
dc.contributor.authorSiwak, M.
dc.contributor.authorKoziel-Wierzbowska, D.
dc.contributor.authorPorowski, C.
dc.contributor.authorKuzmicz, A.
dc.contributor.authorKrzesinski, J.
dc.contributor.authorKundera, T.
dc.contributor.authorWu, J. -H.
dc.contributor.authorZhou, X.
dc.contributor.authorEfimov, Y.
dc.contributor.authorSadakane, K.
dc.contributor.authorKamada, M.
dc.contributor.authorOhlert, J.
dc.contributor.authorHentunen, V. -P.
dc.contributor.authorNissinen, M.
dc.contributor.authorDietrich, M.
dc.contributor.authorAssef, R. J.
dc.contributor.authorAtlee, D. W.
dc.contributor.authorBird, J.
dc.contributor.authorDePoy, D. L.
dc.contributor.authorEastman, J.
dc.contributor.authorPeeples, M. S.
dc.contributor.authorPrieto, J.
dc.contributor.authorWatson, L.
dc.contributor.authorYee, J. C.
dc.contributor.authorLiakos, A.
dc.contributor.authorNiarchos, P.
dc.contributor.authorGazeas, K.
dc.contributor.authorDogru, S.
dc.contributor.authorDonmez, A.
dc.contributor.authorMarchev, D.
dc.contributor.authorCoggins-Hill, S. A.
dc.contributor.authorMattingly, A.
dc.contributor.authorKeel, W. C.
dc.contributor.authorHaque, S.
dc.contributor.authorAungwerojwit, A.
dc.contributor.authorBergvall, N.
dc.contributor.otherUniversity of Turku
dc.contributor.otherRuprecht Karls University Heidelberg
dc.contributor.otherPedagogical University of Cracow
dc.contributor.otherJagiellonian University
dc.contributor.otherUniversity of Toronto
dc.contributor.otherChinese Academy of Sciences
dc.contributor.otherNational Astronomical Observatory, CAS
dc.contributor.otherRussian Academy of Sciences
dc.contributor.otherCrimean Astrophysical Observatory
dc.contributor.otherOsaka University of Education
dc.contributor.otherUniversity System of Ohio
dc.contributor.otherOhio State University
dc.contributor.otherTexas A&M University System
dc.contributor.otherTexas A&M University College Station
dc.contributor.otherNational & Kapodistrian University of Athens
dc.contributor.otherCanakkale Onsekiz Mart University
dc.contributor.otherUniversity of Shumen
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUniversity West Indies Mona Jamaica
dc.contributor.otherUniversity West Indies Saint Augustine
dc.contributor.otherNaresuan University
dc.contributor.otherUniversity of Warwick
dc.contributor.otherUppsala University
dc.date.accessioned2018-09-21T21:26:14Z
dc.date.available2018-09-21T21:26:14Z
dc.date.issued2010
dc.description.abstractOJ 287 is a BL Lac object at redshift z = 0.306 that has shown double-peaked bursts at regular intervals of similar to 12 yr during the last similar to 40 yr. We analyse optical photopolarimetric monitoring data from 2005 to 2009, during which the latest double-peaked outburst occurred. The aim of this study is twofold: firstly, we aim to analyse variability patterns and statistical properties of the optical polarization light curve. We find a strong preferred position angle in optical polarization. The preferred position angle can be explained by separating the jet emission into two components: an optical polarization core and chaotic jet emission. The optical polarization core is stable on time-scales of years and can be explained as emission from an underlying quiescent jet component. The chaotic jet emission sometimes exhibits a circular movement in the Stokes plane. We find six such events, all on the time-scales of 10-20 d. We interpret these events as a shock front moving forwards and backwards in the jet, swiping through a helical magnetic field. Secondly, we use our data to assess different binary black hole models proposed to explain the regularly appearing double-peaked bursts in OJ 287. We compose a list of requirements a model has to fulfil to explain the mysterious behaviour observed in OJ 287. The list includes not only characteristics of the light curve but also other properties of OJ 287, such as the black hole mass and restrictions on accretion flow properties. We rate all existing models using this list and conclude that none of the models is able to explain all observations. We discuss possible new explanations and propose a new approach to understanding OJ 287. We suggest that both the double-peaked bursts and the evolution of the optical polarization position angle could be explained as a sign of resonant accretion of magnetic field lines, a 'magnetic breathing' of the disc.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationVillforth, C. et al. (2010): Variability and stability in blazar jets on time-scales of years: optical polarization monitoring of OJ 287 in 2005–2009. Monthly Notices of the Royal Astronomical Society, 402(3). DOI: https://doi.org/10.1111/j.1365-2966.2009.16133.x
dc.identifier.doi10.1111/j.1365-2966.2009.16133.x
dc.identifier.orcidhttps://orcid.org/0000-0001-6394-1121
dc.identifier.orcidhttps://orcid.org/0000-0002-0490-1469
dc.identifier.orcidhttps://orcid.org/0000-0002-8956-6654
dc.identifier.orcidhttps://orcid.org/0000-0003-1072-2712
dc.identifier.orcidhttps://orcid.org/0000-0002-6293-9940
dc.identifier.orcidhttps://orcid.org/0000-0002-8855-3923
dc.identifier.orcidhttps://orcid.org/0000-0002-8990-0931
dc.identifier.orcidhttps://orcid.org/0000-0001-9587-1615
dc.identifier.orcidhttps://orcid.org/0000-0002-9508-3667
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3942
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectaccretion
dc.subjectaccretion discs
dc.subjectmagnetic fields
dc.subjectpolarization
dc.subjectshock waves
dc.subjectBL Lacertea objects: individual: OJ 287
dc.subjectgalaxies: jets
dc.subjectSHOCKED RELATIVISTIC JETS
dc.subjectBL LACERTAE OBJECTS
dc.subjectBLACK-HOLE MASS
dc.subjectHOST GALAXIES
dc.subjectRADIO-LOUD
dc.subjectSYNCHROTRON EMISSION
dc.subjectPHOTOMETRIC BEHAVIOR
dc.subjectVARIABLE SOURCES
dc.subjectOJ-287
dc.subjectOUTBURSTS
dc.subjectAstronomy & Astrophysics
dc.titleVariability and stability in blazar jets on time-scales of years: optical polarization monitoring of OJ 287 in 2005-2009en_US
dc.typetext
dc.typeArticle
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