Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-04
Mon.Not.Roy.Astron.Soc.345:L19,2003
Astronomy and Astrophysics
Astrophysics
5 pages, accepted to MNRAS pink pages
Scientific paper
10.1046/j.1365-8711.2003.07161.x
A large sample of AGN studied here shows a ``quenching'' of the radio emission occurs when the luminosity is at a few percent to about 10% of the Eddington rate, just as is seen in the high/soft state of X-ray binaries. The result holds even when the sample of AGN includes no Narrow Line Seyfert 1 galaxies (the systems most commonly suggested to be the analog of the high/soft state). This adds substantially to the body of evidence that AGN show the same spectral state phenomenology and related disc-jet coupling as the stellar mass accreting black holes. That the power law correlation between X-ray and radio luminosity is the same in both AGN and X-ray binaries and extends below $10^{-7} L_{EDD}$ strengthens the argument that there is no fundamental difference between the low/hard state and the so-called quiescent state in X-ray binaries. We also discuss possible reasons for the scatter in the radio to X-ray luminosity correlation in the AGN.
Fender Rob
Gallo Elena
Maccarone Thomas J.
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