摘要
在黑色基于 Blandford-Znajek 和磁性的联合进程的共存洞(BH ) 生长圆盘,为喷气力量的一个多参数模型和活跃星群的原子核(AGN ) 的收音机大声被学习。结果, AGN 的收音机大声能被五个参数管理:(ⅰ) BH 旋转,(ⅱ) 变化的一个幂定律索引磁性在圆盘上删除;(ⅲ)决定圆盘的内部边的位置的一个参数,(ⅳ)到生长流动的最深处的部分的公羊压力的领带地平线上的磁场的压力的比率,并且(ⅴ)到地平线的户外 Reldlines 的尖速度的比率。观察两分在之间收音机大声并且收音机安静 AGN 被上述参数的效果很好解释。而且,我们独立关于每个参数讨论 AGN 的收音机大声的衍生物。另外, AGN 的收音机大声上的螺丝钉不稳定性的效果被讨论。
Based on the coexistence of the Blandford-Znajek and magnetic coupling processes in black hole (BH) accretion disc, a multi-parameter model for jet powers and radio loudnees of active galactic nuclei (AGNs) is studied. It turns out that radio-loudnees of AGNs couM be governed by five parameters: (i) the BH spin, (ii) a power-law index of the variation of the magnetic field on the disc; (iii) a parameter determining the position of the inner edge of the disc, (iv) the ratio of the pressure of the magnetic field on the horizon to the ram pressure of the innermost parts of an accretion flow, and (v) the ratio of the angular velocity of the open field lines to that of the horizon. The observed dichotomy between radio-loud and radio-quiet AGNs is well interpreted by the effects of the above parameters. Furthermore, we discuss the derivative of radio loudness of AGNs with respect to each parameter separately. In addition, the effect of the screw instability on radio loudness of AGNs is discussed.
基金
The project supported by National Natural Science Foundation of China under Grant Nos. 10173004, 10373006, and 10121503