Fine structure of the BL Lac object 1803+784

Details Fine structure of the BL Lac object 1803+784 Fine structure of the BL Lac object 1803+784

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astl...34...69m&link_type=abstract

Astronomy Letters, Volume 34, Issue 2, pp.69-85

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We have investigated the superfine structure of the BL Lac object 1803+784, determined the ejector location, the helical structure of the jet, its parameters and relationship to the precession and nutation of the ejector rotation axis, and established the relationship to the periods of enhanced nuclear activity. The multimode precession is shown to be produced by the reactive action of the ejected relativistic plasma flow. The visibility of helix-structure fragments is determined by the transparency of the surrounding thermal plasma—the cocoon wall. The absorption in the cocoon wall has been found to depend on the distance from the core. The absorption of the synchrotron radio emission from the ejector region at 18 cm reaches ˜30 dB. The spectra of the compact components located near the core have a low-frequency cutoff that is determined by the reabsorption of the synchrotron emission and by the absorption in the cocoon wall. The spectral index of the low-frequency part is α = 3.1-4.2.

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