Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-30
Astronomy and Astrophysics
Astrophysics
9 pages, 11 figures. Submitted to A&A on Nov. 29, 2004
Scientific paper
Symmetric extragalactic radio sources exhibit a baffling array of features - the remarkable symmetry between the two lobes, the emission in the radio frequency range, well collimated jets, core regions emitting blue and ultraviolet light, transient X-ray and gamma ray bursts, etc. In this article, we present a model for the kinematics of extragalactic radio sources that explains these features. We establish that an apparent superluminal motion in both the jets of these radio sources (galactic or extragalactic) necessarily implies real superluminal motion. The light travel time effect influences the way we perceive superluminal motion. An object, moving across our field of vision at superluminal speeds, will appear to us as two objects receding from a single point. Based on this fact, we derive the kinematical properties of extragalactic radio sources and explain the puzzling features listed above. Furthermore, we derive the time evolution of the hot spots and compare it to the proper motions reported in the literature. This model can also explain the observed blue/UV spectrum (and its time evolution) of the core region and the RF spectrum of the lobes, and why the radio sources appear to be associated with galactic nuclei. We make other quantitative predictions, which can be verified.
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