04/26/02
Sol Helene	Observatoire de Paris
Place J. Janssen	SF2A- PNG- ASHRA- PCHE-
92295	Meudon, France

Presentation 1 : Poster
Zooming towards Active Galactic Nuclei (PNG)
Woillez, J, Sol, H., Lai, O, Perrin, G.
The advent of large interferometers in the infrared and optical ranges (VLTI, KI, OHANA) will soon open a new window on AGN compact cores, accretion and ejection features, gas, dust and stellar content of galactic nuclei. Simple models of nuclear jets, broad line regions, circumnuclear disks and starbursts are necessary to interpret the expected interferometric parameters and will allow to constrain AGN physics.
Presentation 2 : Poster
Modelling the multifrequency emission of blazars (PCHE)
Katarzynski, K., Sol, H., Kus, A.
Synchrotron and inverse-Compton emission from inhomogeneous jets is quite successful in explaining multifrequency emission of blazars from low energy radio range to TeV energies, once correction for contamination by the host galaxy has been applied. In this frame, we considere two scenarios for VHE flares. Comparison with light curves obtained in radio and other low frequency range allows some test of the models, as we show for Mrk 421.

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