Revisiting the "Fundamental Plane" of Black Hole Activity at Extremely Low Luminosities

Details Revisiting the "Fundamental Plane" of Black Hole Activity at Extremely Low Luminosities Revisiting the "Fundamental Plane" of Black Hole Activity at Extremely Low Luminosities

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..427...36y&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

Physics

Scientific paper

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 logL_R = 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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