Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agn8.confe..40p&link_type=abstract
Proceedings of the 8th National Conference on AGN, held in Torino, Italy, May 19-22, 2008. Edited by L. Lanteri, C.M. Raiteri,
Physics
Scientific paper
We present the results on the correlation found between the nuclear 2-10 keV X-ray and radio (at 2 cm, 6 cm and 20 cm) luminosities for a well defined sample of local Seyfert galaxies, suggesting that the accretion flow and the radio source are strongly coupled in these sources. Interestingly, the slope of the correlation is the same found for low luminosity radio galaxies, i.e., objects that are traditionally classified as radio-loud and whose radio emission is ascribed to synchrotron radiation from relativistic electrons. To shed light on the underlying radio physical mechanisms of these radio-quiet sources, we have observed a sub-sample of Seyferts with VLBI high resolution techniques. Indeed, observations of the pc-scale and subpc-scale region of Seyfert nuclei and LLAGN are often successful in the determination of the physical parameters of the nuclear radio components (such as the brightness temperature, the spectral index, the jet motions, etc.). Preliminary results on the EVN radio observations will be here presented and discussed in comparison with multiwavelength properties and correlations found.
Giroletti Marcello
Panessa Francesca
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