磁场提取ADAF中心黑洞能量研究

Magnetic-field Extraction of Energy from the Central Black Hole of ADAF

利用ADAF(advection-dominated accretionflow,径移主导吸积流)的自相似解,推导出了磁场提取ADAF中心黑洞能量的功率表达式,研究了黑洞的自转a和径移主导参数ε′对功率的影响,并用该功率拟合了另一类活动星系核———BLLac天体的射电喷流功率值。结果表明,在吸积率一定的情况下,该功率主要决定于a,对ε′不敏感,且计算得到的功率能很好地拟合喷流功率的观测数据值。

The self-similar solution of advection dominated accretion flow (ADAF) is used to derive the expression of power for the central black hole of ADAF,the spin α_* of the black hole (BH) and the major radial parameter ε′on the power are studied. The power is also used to match the jet powers of several BL Lac objects. The result shows that under certain condition of given accretion rate,the power mainly depends on α_* and insensitive to ε′. The calculated powers can be used to properly match the observed data of jet powers.