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| Paper: |
Revisiting the “Fundamental Plane” of Black Hole Activity at Extremely Low Luminosities |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
36 |
| Authors: |
Yuan, F.; Yu, Z.; Ho, L. C. |
| Abstract: |
We investigate the origin of the X-ray emission in low-luminosity
AGNs (LLAGNs). Yuan & Cui (2005) predicted that the X-ray emission
should originate from jets rather than from an advection-dominated
accretion flow (ADAF) when the X-ray luminosity LX of the
source is below a critical value of LX,crit ≈
10–6 LEdd. This prediction implies that the X-ray spectrum
in such sources should be fitted by jets rather than ADAFs.
Furthermore, below LX,crit the correlation between radio
(LR) and X-ray (LX) luminosities and the black
hole mass (M)—the so-called fundamental plane of black hole
activity—should deviate from the general correlation obtained by
Merloni, Heinz & Di Matteo (2003) and become steeper. The Merloni
et al. correlation is described by logLR = 0.6logLX + 0.78logM + 7.33, while the predicted correlation
is logLR = 1.23logLX + 0.25logM – 13.45. We collect data from the literature to check the
validity of these two expectations. We find that among the 16 LLAGNs
with good X-ray and radio spectra, 13 are consistent with the Yuan
& Cui prediction. For the 22 LLAGNs with LX < LX,crit, the fundamental plane correlation is described by logLR = 1.22logLX + 0.23logM – 12.46, also in
excellent agreement with the prediction. |
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