Parsec-Scale Blazar Monitoring: Flux and Polarization Variability

Details Parsec-Scale Blazar Monitoring: Flux and Polarization Variability Parsec-Scale Blazar Monitoring: Flux and Polarization Variability

2001-10-17

arxiv.org/abs/astro-ph/0110408v2

Astronomy and Astrophysics

Astrophysics

35 pages, 30 figures, accepted by the Astrophysical Journal (Changes from original version: typos corrected and a clarificatio

Scientific paper

10.1086/338701

We present analysis of the flux and polarization variability of parsec scale radio jets from a dual-frequency, six-epoch, VLBA polarization experiment monitoring 12 blazars. The observations were made at 15 and 22 GHz at bimonthly intervals over 1996. Here we analyze the flux, fractional polarization, and polarization position angle behavior of core regions and jet features, considering both the linear trends of these quantities with time and more rapid fluctuations about the linear trends. The dual frequency nature of the observations allows us to examine spectral evolution, to separate Faraday effects from changes in magnetic field order, and also to deduce empirical estimates for the uncertainties in measuring properties of VLBI jet features (abridged).

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