Studies of the Fine Structure of the Object 1803+784

Details Studies of the Fine Structure of the Object 1803+784 Studies of the Fine Structure of the Object 1803+784

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27....1b&link_type=abstract

Astronomy Letters, vol. 27, p. 1-14 (2001)

Astronomy and Astrophysics

Astronomy

9

Active Galactic Nuclei, Low-Frequency Variability, Absorption, Vlbi

Scientific paper

We have investigated the fine structure of the object 1803+784 at a wavelength of 18 cm with an angular resolution of ~0.5 mas. The structure consists of a core (injector) and a jet. The angle of the relativistic plasma outflow is equal to the angle of a conical diverging helix - the trajectory of compact components, suggesting a similar shape of the jet. The helical structure and the curvature of the jet axis are assumed to be determined by rapid and long-period precession of the rotation axis. The core radio emission at 18 cm is attenuated by absorption in the ambient ionized medium (cocoon wall) by > 25 db. The bright compact component is the nearby part of the jet extending outside the dense part of the screen. Ionization variations in the medium cause low-frequency radio variability. Screen parameters are estimated.

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