Evidence for radio-silent seyfert nuclei.
Chiaraluce E. , Panessa F., Bruni G.
III - Astrofisica
Aula 32B-3 - Mercoledì 19 h 09:00 - 13:00
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The origin of radio emission in low-luminosity AGN is still matter of debate. We used high-resolution ($\le1\,$arcsec), multi-frequency (1.4, 6, 10 and 15 GHz) EVLA observations to investigate the nuclear region of the faintest Seyferts in Cappi et al. (2006) at tens uJy/beam level. The morphology of the detected sources is predominantly compact, either unresolved or marginally resolved. Three sources exhibit flat/inverted spectra a hint for radio emission from an optically-thick core. Four sources have not been detected at any wavelength at our sensitivity, suggesting the presence of radio-silent cores.