Frequency-dependent time delays for strong outbursts in selected blazars from the Metsähovi and UMRAO monitoring data bases – II

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dc.contributor.author Pyatunina, T. B.
dc.contributor.author Kudryavtseva, N. A.
dc.contributor.author Gabuzda, Denise
dc.contributor.author Jorstad, S. G.
dc.contributor.author Aller, M. F.
dc.contributor.author Aller, H. D.
dc.contributor.author Teräsranta, H.
dc.date.accessioned 2017-11-07T09:38:57Z
dc.date.available 2017-11-07T09:38:57Z
dc.date.issued 2007
dc.identifier.citation Pyatunina, T. B., Kudryavtseva, N. A., Gabuzda, D. C., Jorstad, S. G., Aller, M. F., Aller, H. D. and Teräsranta, H. (2007) 'Frequency-dependent time delays for strong outbursts in selected blazars from the Metsähovi and UMRAO monitoring data bases – II', Monthly Notices of the Royal Astronomical Society, 381(2), pp. 797-808. doi: 10.1111/j.1365-2966.2007.12281.x en
dc.identifier.volume 381
dc.identifier.issued 2
dc.identifier.startpage 797
dc.identifier.endpage 808
dc.identifier.issn 0035-8711
dc.identifier.uri http://hdl.handle.net/10468/4979
dc.identifier.doi 10.1111/j.1365-2966.2007.12281.x
dc.description.abstract We analyse the radio light curves of the blazars 1308+326, 2223-052 and 2251+158 using University of Michigan Radio Observatory and Metsähovi Radio Observatory multifrequency monitoring data combined with high-resolution very long baseline interferometry (VLBI) observations in order to extract the properties of prominent outbursts. The outbursts are classified as 'core' and 'jet' events according to their behaviour at different frequencies and their associations with features appearing in the VLBI jet. We define the activity cycle for each blazar as the time interval between successive 'core' outbursts. The durations of the activity cycle derived in this way are >= 14 yr for 1308+326, similar to 12 yr for 2223-052 and 12.4 +/- 0.6 yr for 2251+158. We find an unusual frequency dependence for the time profiles for a major flare in 1308+326, which may provide evidence for acceleration or bending of the jet flow in the optically thick part of the emission region. Analysis of these activity cycles, combined with our earlier results, leads us to suggest that more luminous blazars possess shorter activity cycles, consistent with the accretion rates being higher in more powerful sources (relative to the Eddington rate). en
dc.description.sponsorship National Science Foundation (AST04-06865)
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.relation.uri https://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2007.12281.x
dc.rights © 2007, the Authors. Journal compilation © 2007, RAS en
dc.subject Galaxies en
dc.subject Active en
dc.subject Jets en
dc.subject Quasars en
dc.subject Individual en
dc.subject 1308+326 en
dc.subject 2223-052 (3C 446) en
dc.subject 2251+158 (3C 454.3) en
dc.title Frequency-dependent time delays for strong outbursts in selected blazars from the Metsähovi and UMRAO monitoring data bases – II en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Denise Gabuzda, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: d.gabuzda@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Rheinische Friedrich-Wilhelms-Universität Bonn
dc.contributor.funder Universität zu Köln
dc.contributor.funder National Science Foundation
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress d.gabuzda@ucc.ie en


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