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| Paper: |
Optical Spectroscopy of 3CR Sources: Accretion and Jet Launching in
Radio Galaxies |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
147 |
| Authors: |
Buttiglione, S.; Capetti, A. |
| Abstract: |
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. |
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