VLBI and broad-band radio spectra study of the strongly variable extragalactic object 0524+034

Details VLBI and broad-band radio spectra study of the strongly variable extragalactic object 0524+034 VLBI and broad-band radio spectra study of the strongly variable extragalactic object 0524+034

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..100k&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Computer Science

Scientific paper

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 RATAN-600 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, one-sided core-jet structure in a structural position angle of about -90o. 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 long-term 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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