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| Paper: |
Optical/UV/X-ray Insights into the RL–RQ Dichotomy |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
371 |
| Authors: |
Sulentic, J.; Zamfir, S.; Marziani, P. |
| Abstract: |
We explore the relationship between radio-loud (RL) and radio-quiet (RQ) quasars
using a set of optical/UV/X-ray measures that are quite independent of radio measures.
We find RL sources to show larger average FWHM Hβ, weaker FeII emission, no
soft X-ray excess and no CIV blueshift–all characteristics manifested by a large
fraction of RQ quasars (that we call Population A). We find that log L1.4Ghz =31.6
ergs s-1 Hz-1 (or R=70) is the lower limit for RL quasars showing
FRII morphology. We find no evidence for a hidden FRII population below this level.
We conclude that RL sources are a distinct quasar population that may also include
30-40% of RQ sources which apparently show similar geometry and kinematics (what
we call Population B). This RQ overlap, if not coincidental, may include inactive RL
quasars as well as quasars with geometry/kinematics similar to RL sources but
where RL activity is inhibited in some way (e.g. host morphology, BH spin). |
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