Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-31
Astronomy and Astrophysics
Astrophysics
53 pages, 19 figures, to appear in 'The Role of VLBI in Astrophysics, Astronomy and Geodesy', NATO Conf. Series, F.Mantovani a
Scientific paper
In the framework of the study of extragalactic radio sources, we will focus on the importance of the spatial resolution at different wavelengths, and of the combination of observations at different frequency bands. In particular, a substantial step forward in this field is now provided by the new generation X-ray telescopes which are able to image radio sources in between 0.1--10 keV with a spatial resolution comparable with that of the radio telescopes (VLA) and of the optical telescopes. After a brief description of some basic aspects of acceleration mechanisms and of the radiative processes at work in the extragalactic radio sources, we will focus on a number of recent radio, optical and X-ray observations with arcsec resolution, and discuss the deriving constraints on the physics of these sources.
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