Oral Presentation

High-energy and very-high-energy emission from rapidly rotating black holes

Author(s): Kouichi Hirotani (ASIAA)

Presenter: Kouichi Hirotani (ASIAA)

It is widely accepted that the electromagnetic extraction of the rotational energy of black holes (BHs) is one of the promising mechanisms for powering galactic BH binaries and active galactic nuclei (AGNs). A small portion of this extracted energy can be dissipated near the BH, if there appears a charge deficit in the magnetosphere. In this context, we apply the pulsar vacuum gap theory to BH magnetospheres and found that significant gamma-rays are emitted from the direct vicinity of slightly accreting, rapidly rotating BHs. Theoretical predictions are compared with HE and VHE observations for various BH masses, e.g., from stellar-mass BHs in low-mass X-ray binaries during quiescence to super-massive BHs in low-luminosity AGNs.