Determination of the Spins of Supermassive Black Holes in FR I and FR II Radio Galaxies

被引:5
|
作者
Mikhailov, A. G. [1 ]
Gnedin, Yu. N. [1 ]
机构
[1] Russian Acad Sci, Main Pulkovo Astron Observ, St Petersburg 196140, Russia
关键词
ACTIVE GALACTIC NUCLEI; FANAROFF; JETS;
D O I
10.1134/S1063772918010067
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The spins of supermassive black holes in FR I and FR II radio galaxies are estimated using two models for the generation of the relativisitic jets, based on the Blandford-Znajek and Blandford-Payne mechanisms: the hybrid model of Meier and a flux-trapping model. The magnetic field at the event horizon is estimated assuming equipartition between the energy densities of the magnetic field and the accreting material. The magnetic field near the inner edge of the accretion disk is estimated assuming equipartition between the magnetic pressure and the radiation pressure, and also assuming proportionality between the magnetic field and the spin. In the case of FR I objects, both mechanisms for the generation of the jets (the hybrid model of Meier and a flux-trapping model) are efficient. For the FR II objects, equipartition between the energy densities of the magnetic field and the accretion flow facilitates stronger retrograde rotation of the supermassive black hole. Plots of spin versus mass suggest a predominantly chaotic character for the accretion in both types of radio galaxies.
引用
收藏
页码:1 / 8
页数:8
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