2004/12/13 by E. Massaro, Massaro, E., F. Mantovani +1
Engineering · Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Particle Accelerators and Free-Electron Lasers #Radio Astronomy Observations and Technology #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0412290
4 pages, 4 figures. Proceedings of the 7th European VLBI Network Symposium held in Toledo, Spain on October 12-15, 2004. Editors: R. Bachiller, F. Colomer, J.-F. Desmurs, P. de Vicente (Observatorio Astronomico Nacional), p. 11-14. Needs evn2004.cls
arxiv created 2004/12/13 · openalex publication_date 2004/12/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Optical light curves of bright BL Lac objects, in particular those having the SED synchrotron peak at frequencies lower than 10E14 Hz, are characterized by long-term trends with time scales of a few decades. These variations are probabily not related to fast perturbations moving down the jet, which have a much faster evolution, but more likely to slow changes of other physical or geometrical parameters, for example the jet direction. In these cases we can expect changes of the inner jet structure detectable with VLBI imaging. Recent literature results are reviewed and discussed in this context.