MG11 
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A magnetic connection model for powering relativistic jets from supermassive Kerr black holes

We propose a theoretical model for powering relativistic jets in Active Galactic Nuclei (AGN) from an accreting Kerr black hole (BH) by converting the accreted gas binding energy into jets energy in the context of magnetic connection (MC) between the BH and the accretion disk. The extractable spin energy of the BH may be transferred to the accretion disk through closed magnetic field lines that connect them (MC), providing a supplementary energy source particularly for a low-accretion disk. Adding these two energy sources (the rest-mass energy flow in the disk and the spin energy of the BH transferred to the accretion disk), we derive the launching power of the jets by integrating the energy conservation law over the inner disk, where the frame dragging effect takes place for both the sub-Eddington rates and Eddington accretion rate. We find the launching power of the jets ranges from $\sim 10^{45}$ to $\sim 10^{47}\, erg/s$ for a BH of $10^9 M_{\odot}$. In the case of a very low accretion rate, a MC spin-down of the BH powers the jets, so that the jet-launching efficiency can reach values close to unity. That is, almost all of the power uses to launch the jets is borrowed from the BH extractable rotational energy so that the jets can still be driven even though the contribution of the rest-mass energy of the accreted flow is very low. The consequences of this model of launching the jets for the evolution of the BH in AGN is described.