NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T08:47:54 PDT
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For refcode 2009ApJ...703.1034Y:
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...703.1034Y Revisiting the "Fundamental Plane" of Black Hole Activity at Extremely Low Luminosities Yuan, Feng; Yu, Zhaolong; Ho, Luis C. Abstract. We investigate the origin of the X-ray emission in low-luminosity active galactic nuclei (LLAGNs). Yuan and Cui predicted that the X-ray emission should originate from jets rather than an advection-dominated accretion flow (ADAF) when the X-ray luminosity L_X_ of the source is below a critical value of L_X,crit_ ~ 10^-6^ L_Edd_. This prediction implies that the X-ray spectrum in such sources should be fitted by jets rather than ADAFs. Furthermore, below L_X,crit_ the correlation between radio (L_R_) and X-ray (L_X_) 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 et al. and become steeper. The Merloni et al. correlation is described by logL_R_ = 0.6logL_X_ + 0.78logM + 7.33, while the predicted correlation is logL_R_ = 1.23logL_X_ + 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 and Cui prediction. For the 22 LLAGNs with L_X_ < L_X,crit_, the fundamental plane correlation is described by logL_R_ = 1.22logL_X_ + 0.23logM - 12.46, also in excellent agreement with the prediction. Key words: accretion, accretion disks, black hole physics, galaxies: active, quasars: general, X-rays: general
Retrieve 32 NED objects in this reference.
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