摘要
The famous jet production mechanism, i.e. the Blandford and Znajek （BZ） process, has realized the idea proposed by Penrose that the rotational en- ergy of a black hole （BH） could be extracted from the ergosphere. In the BZ process, large-scale magnetic fields connecting the BH horizon and the remote as- trophysical load can extract the energy and angular momentum of the rotating BH in the form of electro- magnetic energy. The BZ mechanism was successful in explaining astrophysical jets and was widely used in high energy astrophysics. As a variation of the BZ process, the magnetic connection （MC） between the BH horizon and the accretion disk, namely, the MC process, was later discussed by researchers. Li discovered that the extractable energy of an extreme Kerr BH in the MC process can reach ～0.15Mc2, which is higher than that in the BZ process, where M is the BH mass and c is the light speed. In recent years, some astrophysical phenomena observed in BH systems, such as broad iron emission lines and high frequency quasi-periodic oscillations （QPOs）, re- veal the importance of the MC process. How- ever, we are still interested in how the extracted en- ergy is dissipated in the inner accretion disk and how it affects the accretion flow and the x-ray spectrum remains unclear.
The famous jet production mechanism, i.e. the Blandford and Znajek （BZ） process, has realized the idea proposed by Penrose that the rotational en- ergy of a black hole （BH） could be extracted from the ergosphere. In the BZ process, large-scale magnetic fields connecting the BH horizon and the remote as- trophysical load can extract the energy and angular momentum of the rotating BH in the form of electro- magnetic energy. The BZ mechanism was successful in explaining astrophysical jets and was widely used in high energy astrophysics. As a variation of the BZ process, the magnetic connection （MC） between the BH horizon and the accretion disk, namely, the MC process, was later discussed by researchers. Li discovered that the extractable energy of an extreme Kerr BH in the MC process can reach ～0.15Mc2, which is higher than that in the BZ process, where M is the BH mass and c is the light speed. In recent years, some astrophysical phenomena observed in BH systems, such as broad iron emission lines and high frequency quasi-periodic oscillations （QPOs）, re- veal the importance of the MC process. How- ever, we are still interested in how the extracted en- ergy is dissipated in the inner accretion disk and how it affects the accretion flow and the x-ray spectrum remains unclear.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11173011, 11403003 and U1431101, the Scientific Research Development Fund of Yangtze University under Grant No 801080010119, and the Technology Creative Project of Excellent Middle and Young Team of Hubei Province under Grant No T201204.
