Revisiting the Fundamental Planes of Black Hole Activity for Strong Jet Sources

Qing-Chen. Long, Ai-Jun. Dong, Qin-Jun. Zhi, Lun-Hua. Shuang

Published 2025-01-20Version 1

Whether the X-ray emissions of strong jet sources originate from disk+coronas or jets is still controversial. In this work, we constructed a strong jet sample containing 50 flat-spectrum radio quasars (FSRQs), 51 low-synchrotron-peaked BL BLacs (LBLs) and 18 intermediate-synchrotron-peaked BL BLacs (IBLs) to explore the origin of X-ray emissions. Generally, blazars are the typical radio-loud active galactic nucleus (RL-AGNs) with a powerful jet towards the observer, causing their broadband emissions to be boosted. By considering the Doppler boosting effect, we obtain the intrinsic radio--X-ray correlation and the Fundamental Plane of black hole activity (FP) for the strong jet sources: the intrinsic radio--X-ray correlation is $L_{\rm{R,int}}\propto L_{\rm{X,int}}^{1.04}$, which favor the jet-dominate mode, the intrinsic FP is $\log L_{\rm{R,int}}=(1.07\pm0.06)\log L_{\rm{X,int}}-(0.22\pm0.10)\log M_{\rm{BH}}-(3.77\pm2.11)$, which can be interpreted by the hybrid mode of Jet+SSD. Our results suggest that the X-ray emissions of strong jet sources are dominated by the jets, but there may also be a small contribution from the disk. In addition, the radio--X-ray correlation and FP of strong jet sources have not a significant dependence on the Eddington-ratio.