Journal Article

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

N. A. Kudryavtseva, D. C. Gabuzda, M. F. Aller and H. D. Aller

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1631-1637
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18808.x
A new method for estimating frequency-dependent core shifts in active galactic nucleus jets

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We 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 ≃0.1 G and magnetic field at 1 pc ≃ 0.4 G.

Keywords: galaxies: active; galaxies: individual: 3C 345; galaxies: jets; galaxies: magnetic fields

Journal Article.  4615 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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