Abstract The observed vLv(5100Å)-MBH correlation is used to probe the magnetic field of black holes harbored in active galactic nuclei (AGNs). The model is based on the assumption that the disk is heated by energy injection due to the magnetic coupling (MC) process and the gravitational dissipation due to accretion. The MC process can transfer energy and angular momentum from a rotating Kerr black hole to its surrounding disk. The relation of vLv(5100Å)-MBH as functions of the spin (a*) and magnetic field (BBH) of the black hole (BH) is modelled. The model predicts that vLv(5100Å) emitted from the disk is sensitive to the strength of the poloidal component of the magnetic field on the BH horizon. Based on the observations of vLv(5100Å) for 143 AGN sources, we obtain the correlation between MBH and BBH, which shows completely different results from the situation without considering the magnetic field coupling process.
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