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| Paper: |
The Radio and X-ray Coupling in Radio–Quiet AGN |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
377 |
| Authors: |
Panessa, F.; Giroletti, M. |
| Abstract: |
Sensitive observations reveal that radio-quiet Active Galactic Nuclei (AGN) are
not radio silent. A strong correlation found between the
nuclear 2-10 keV X-ray and radio luminosities for a
well defined sample of local Seyfert galaxies, suggests that the accretion flow
and the radio source are strongly coupled. In these sources
the accretion rate is linked to the radio-loudness,
as expected in low luminosiy AGN where an advection-dominated accretion flow
is supposed to be coupled with a compact radio jet. However, the same correlation
has been found also for high luminosity AGN where instead
standard accretion thin disk is responsible for the high energy emission.
We present recent results on VLBI radio observations of very low
luminosity AGN which had revealed an ubiquitous presence of sub-parsec cores and/or structures
going down to sub-mJy flux densities compatible with jet-base or outflow physical scenarios. |
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