Computer Science
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..427..147b&link_type=abstract
Accretion and Ejection in AGN: a Global View. Proceedings of a conference held June 22-26, 2009 in Como, Italy. Edited by Laura
Computer Science
Scientific paper
We use a 92% complete optical spectra dataset of 104 3CR radio sources with z<0.3 to explore their spectroscopic and multiwavelength properties. We find the presence of two main sub-populations, High and Low Excitation Galaxies. All broad-line objects are HEG from the point of view of their narrow emission line ratios and all HEG are associated to FRII radio-galaxies. Conversely LEG are of both FRI and FRII type. In a line vs radio luminosity plane, HEG and LEG obey to two linear correlations, with HEG being 10 times brighter than LEG in [OIII]. HEG and LEG are also separated in a plane that compares black hole mass and nuclear luminosity. The transition from LEG to HEG occurs at a ˜0.001 fraction of the Eddington luminosity. LEG show a lower level of accretion, of line and nuclear luminosities, but they can be associated to the most powerful FRII radio-sources of the sample. This suggests that the processes of accretion and the jet launching are at least partially decoupled.
Buttiglione Sara
Capetti Alessandro
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