Helical motion and the origin of QPO in blazar-type sources

Details Helical motion and the origin of QPO in blazar-type sources Helical motion and the origin of QPO in blazar-type sources

2004-10-22

arxiv.org/abs/astro-ph/0410530v1

Chin.J.Astron.Astrophys. 5S (2005) 305

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure; presented at the 5th Microquasar Workshop, Beijing, June 2004. Accepted for publication in the Chinese Jour

Scientific paper

Recent observations and analysis of blazar sources provide strong evidence for (i) the presence of significant periodicities in their lightcurves and (ii) the occurrence of helical trajectories in their radio jets. In scenarios, where the periodicity is caused by differential Doppler boosting effects along a helical jet path, both of these facts may be naturally tied together. Here we discuss four possible driving mechanisms for the occurrence of helical trajectories: orbital motion in a binary system, Newtonian-driven jet precession, internal jet rotation and motion along a global helical magnetic field. We point out that for non-ballistic helical motion the observed period may appear strongly shortened due to classical travel time effects. Finally, the possible relevance of the above mentioned driving mechanisms is discussed for Mkn~501, OJ 287 and AO 0235+16.

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