Radio-X-Ray Correlation and the “Quiescent State” of Black Hole Sources
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Recently a correlation between the radio and X-ray luminosities, LR ∝ L, was found in black hole sources including black hole candidates in our Galaxy and active galactic nuclei. We show that the correlation can be understood in the context of an accretion-jet model developed for explaining the spectral and timing properties of XTE J1118+480. More importantly, we show that when the X-ray luminosity is below a critical value, ≲(10-5 to 10-6)LEdd, if the jet persists, the correlation should turn and become steeper, LR ∝ L, and the X-radiation of the system should be dominated by the emission from the jet, rather than by the accretion flow. Possible observational evidence for our predictions is presented, and future observations to further test our predictions are proposed.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/1a99ff6842b8592dde68177981b647964119ce4e
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Citations in the corpus
- THE FUNDAMENTAL PLANE OF ACCRETION ONTO BLACK HOLES WITH DYNAMICAL MASSES (2009, background): “23X at low accretion rates (Yuan & Cui 2005).”
- Radiative efficiency of hot accretion flows (2012, methodology): “This correlation has been quantitatively explained by Yuan & Cui (2005) using the coupled jet–ADAF model, in which the radio and X-ray emissions are dominated by the radiation from the jet and ADAF, respectively.”
- Hot Accretion Flows Around Black Holes (2014, background): “(37) This is because radiation from a hot accretion flow at low ṀBH is roughly ∝ Ṁ2BH (§2.4) while that from the jet is ∝ ṀBH (Heinz 2004, Yuan & Cui 2005).”
- The subarcsecond mid-infrared view of local active galactic nuclei – II. The mid-infrared–X-ray correlation (2015, background): “The synchrotron emission of this jet might contribute or even dominate both the X-ray emission and the mid-infrared for low accretion rates (e.g., Falcke, Körding & Markoff 2004; Yuan & Cui 2005;Perlman et al. 2007).”
- Nuclear Activity in Nearby Galaxies (2008, background): “At the opposite extreme, sources with Lbol/LEdd ∼ 10 −6.5 may also show a systematic downturn, in possible agreement with the proposal by Yuan & Cui (2005) that below a critical threshold, LX ≈ 10 −5.5LEdd, both the radio and the X-rays should be dominated by emission from the jet.”
- The 'universal' radio/X-ray flux correlation : the case study of the black hole GX 339-4 (2012, background): “Furthermore, no break in the correlation is observed at lower luminosity with the available data (as expected in some theoretical model , e.g. Yuan & Cui 2005), but this could occur at even lower luminosity (Yuan, Yu & Ho 2009).”
- NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. II. NATURE, ORIGIN, AND PROPERTIES OF OUTFLOWS AND THEIR POSSIBLE OBSERVATIONAL APPLICATIONS (2012, result): “This is consistent with the modeling result in Yuan & Cui (2005).”
- A radio-emitting outflow in the quiescent state of A0620−00: implications for modelling low-luminosity black hole binaries (2006, methodology): “In any case, the model generalisation (Yuan & Cui 2005) predicts that the observed radio/X-ray correlation in hard state BHBs (GFP03) should break down at low quiescent luminosities.”