A new method for estimating frequency-dependent core shifts in active galactic nucleus jets

dc.contributor.authorKudryavtseva, N. A.
dc.contributor.authorGabuzda, Denise
dc.contributor.authorAller, M. F.
dc.contributor.authorAller, H. D.
dc.contributor.funderUniversity of Michigan
dc.contributor.funderNational Aeronautics and Space Administration
dc.contributor.funderNational Science Foundation
dc.contributor.funderScience Foundation Ireland
dc.contributor.funderUniversität zu Köln
dc.contributor.funderRheinische Friedrich-Wilhelms-Universität Bonn
dc.date.accessioned2017-11-07T09:38:55Z
dc.date.available2017-11-07T09:38:55Z
dc.date.issued2011
dc.description.abstractWe discuss the opacity in the core regions of active galactic nuclei observed with Very Long Baseline Interferometry (VLBI), and describe a new method for deriving the frequency-dependent shifts of the VLBI core from the frequency-dependent time lags of flares observed with single-dish observations. Application of the method to the core shifts of the quasar 3C 345 shows a very good agreement between the core shifts directly measured from VLBI observations and derived from flares in the total flux density using the proposed method. The frequency-dependent time lags of flares can be used to derive physical parameters of the jets, such as distance from the VLBI core to the base of the jet and the magnetic fields in the core region. Our estimates for 3C 345 indicate core magnetic fields similar or equal to 0.1 G and magnetic field at 1 pc similar or equal to 0.4 G.en
dc.description.sponsorshipRheinische Friedrich-Wilhelms-Universität Bonn/Universität zu Köln (International Max Planck Research School (IMPRS) for Radio and Infrared Astronomy)
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKudryavtseva, N. A., Gabuzda, D. C., Aller, M. F. and Aller, H. D. (2011) 'A new method for estimating frequency-dependent core shifts in active galactic nucleus jets', Monthly Notices of the Royal Astronomical Society, 415(2), pp. 1631-1637. doi: 10.1111/j.1365-2966.2011.18808.xen
dc.identifier.doi10.1111/j.1365-2966.2011.18808.x
dc.identifier.endpage1637
dc.identifier.issn0035-8711
dc.identifier.issued2
dc.identifier.journaltitleMonthly Notices of the Royal Astronomical Societyen
dc.identifier.startpage1631
dc.identifier.urihttps://hdl.handle.net/10468/4963
dc.identifier.volume415
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2011.18808.x
dc.rights© 2011, the Authors. Monthly Notices of the Royal Astronomical Society © 2011, RASen
dc.subjectGalaxiesen
dc.subjectActiveen
dc.subjectIndividualen
dc.subject3C 345en
dc.subjectJetsen
dc.subjectMagnetic fieldsen
dc.titleA new method for estimating frequency-dependent core shifts in active galactic nucleus jetsen
dc.typeArticle (peer-reviewed)en
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