Are There Low Radiative Efficiency Accretion Disks in Low Luminosity AGN?

Details Are There Low Radiative Efficiency Accretion Disks in Low Luminosity AGN? Are There Low Radiative Efficiency Accretion Disks in Low Luminosity AGN?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7217c&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #72.17; Bulletin of the American Astronomical Society, V

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We have studied a carefully selected sample of local low luminosity AGN composed by LINERs, Seyferts and low luminosity radio galaxies, which have been imaged with the Hubble Space Telescope. We find faint unresolved nuclei in a significant fraction of the objects. The nuclear emission is as low as 10-8 times the Eddington luminosity, indicating extremely low radiative efficiency for the accretion process. The nuclei show a dichotomy as far as their radio loudness is concerned, and best separate in a plane in which the Loptical/LEdd is plotted against the nuclear radio loudness. This plane allow us to find objects that are the best candidates for hosting ADAF-like radiatively unefficient accretion, which can only be indentified using HST. Other planes showing an intriguing apparent unification of sources associated to black holes (from galactic BH to powerful QSOs) such as the so-called "Fundamental plane of black hole activity" are less useful for diagnostic purposes. The case of NGC4565 is promising: the object is a low-luminosity Seyfert galaxy which does not show significant nuclear absorption and its SED is peculiar. NGC4565 may thus represent the first case in which optical emission from an ADAF-like process is directly observed in an AGN.

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