paper

Revisit the fundamental plane of black-hole activity from sub-Eddington to quiescent state

arXiv:1509.05088 · doi:10.1093/mnras/stv1801

Abstract

It is very controversial whether radio--X-ray correlation as defined in LH state of XRBs can extend to quiescent state (e.g., X-ray luminosity less than a critical value of ) or not. In this work, we collect a sample of XRBs and low luminosity active galactic nuclei (LLAGNs) with wide distribution of Eddington ratios to reexplore the fundamental plane between 5 GHz radio luminosity, , 2-10 keV X-ray luminosity, , and black hole (BH) mass, , namely . For the whole sample, we confirm the former fundamental plane of Merloni et al. and Falcke et al. that and even after including more quiescent BHs. The quiescent BHs follow the fundamental plane very well, and, however, FR I radio galaxies follow a steeper track comparing other BH sources. After excluding FR Is, we investigate the fundamental plane for BHs in quiescent state with and sub-Eddington BHs with respectively, and both subsamples have a similar slope, , which support that quiescent BHs may behave similar to those in low-hard state. We further select two subsamples of AGNs with BH mass in a narrow range (FR Is with and other LLAGNs with ) to simulate the behavior of a single supermassive BH evolving from sub-Eddington to quiescent state. We find that the highly sub-Eddington sources with still roughly stay on the extension of radio--X-ray correlation as defined by other sub-Eddington BHs. Our results are consistent with several recent observations in XRBs that the radio--X-ray correlation as defined in low-hard state can extend to highly sub-Eddington quiescent state.

8 pages, 3 figures, MNRAS 453,3447-3454, 2015

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