Black Hole Fundamental Plane in Low-Excitation Radio Galaxies

Abstract

The radio-X-ray slope in the fundamental plane of radio-loud active galactic nuclei (AGNs) is found to be steeper compared with that of radio-quiet AGNs in previous works. In this work, we reinvestigate the fundamental plane in radio-loud AGNs by compiling a sample of 13 low-excitation radio galaxies (LERG) from the 3CR radio galaxies, for the reason that the accretion mode in LERG is believed to be a radiatively inefficient accretion flow. All the sources in our sample possess the data available at both the 5 GHz core radio luminosity detected by VLA/VLBI/VLBA and the core X-ray luminosity detected by Chandra/XMM-Newton. Surprisingly, we find the slope in the fundamental plane ($\log L_{\mathrm{R}}=0.52\log L_{\mathrm{X}}+0.84\log M_{\mathrm{BH}}+10.84$) of LERG is well consistent with that reported by \citet{m2003}. However, the normalization is found to be shifted by about 0.7 dex, which can be due to the difference on magnetic field strength in different objects. A shallower slope of $L_{\mathrm{R}}-L_{\mathrm{X}}$ relation ($L_{\mathrm{R}}\sim L_{\mathrm{X}}^{0.63}$) is also given by our sample, which demonstrates that the X-ray emission in LERG may come from accretion disc instead of jets as suggested by previous works.

12 pages, 3 figures, 1 table, accepted by MNRAS Letters

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• Radio/X-ray Correlation in the Mini-Outburts of Black Hole X-ray Transient GRS 1739--278
• The composite X-ray spectra of radio-loud and radio-quiet SDSS quasars
• A nearby luminous AGN sample optically selected from Hubble Space Telescope (HST)
• Constraining X-ray emission of magnetically arrested disk (MAD) by radio-loud AGNs with extreme ultraviolet (EUV) deficit
• The origin of X-ray emission in 3CRR sources: hints from mid-infrared Spitzer observations