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Title: A VLBI and broad band radio spectra study of the strongly variable
extragalactic object 0524+034
Authors: Kovalev, Y. Y.; Gorshkov, A. G.; Konnikova, V. K.; Mingaliev, M. G.
Affiliation: AA(Astro Space Center, Russia)
Journal: Galaxies and their Constituents at the Highest Angular Resolution, International
Astronomical Union. Symposium no. 205. Manchester, England, August 2000.
Publication Date: 00/2000
Origin: AUTHOR
Bibliographic Code: 2000IAUS..205E..78K
Abstract
The object 0524+034 was first detected in the Zelenchuk survey in 1979, and later its flux was found to
vary by a factor of more than ten at 7.5 GHz with a characteristic time scale of several years. A flux
density variability on a time scale less than 10 days was found in the simultaneous observations carried
out with the RATAN­600 radio telescope at 0.97, 2.3. 3.9, 7.7, 11.1, and 21.7 GHz in 1998. The flux
density variations are correlated at all frequencies, at which the variability is revealed, including the
optically thick part of the spectrum. Here, we report the results of the first measurements of a VLBI
structure of 0524+034 at 6 cm with the EVN in 1999. We also present the recent broad band spectra
monitoring data obtained simultaneously with and after the EVN experiment. The source shows a
compact, one­sided core­jet structure in a structural position angle of about ­90 o . Indications are that the
jet is beginning to curve. The rapid changes of the broad band spectrum are confirmed, although the flux
dropped several times since 1998. We suppose that precession of the relativistic jet can be one of the
possible mechanisms to account for the observed milliarcsecond structure and the strong long­term
variations of the spectrum. The rapid changes may be interpreted as the propagation of a shock in the
inhomogeneous jet plasma.
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