论文标题
活性银河核的物理参数，这些核来自射流几何过渡区域的性质
Physical parameters of active galactic nuclei derived from properties of jet geometry transition region
论文作者
论文摘要
我们使用观察到的从抛物线形状到圆锥形的射流边界过渡，该过渡早些时候被发现是活跃银河核中的常见效应，以估计黑洞，射流和环境培养基参数。我们早些时候解释了由于射流内部特性的变化而导致的几何转变：从磁性支配到电气方案的过渡。这种解释使我们能够使用观察到的射流形状断裂位置和在过渡点的射流宽度为11个活跃的银河系核。使用我们的方法获得的黑洞旋转值与旋转演化建模的红移$ z <2 $的来源的较低估计值一致。我们发现，基于宽线区域大小及其发光度之间的关系，黑洞质量测定的方法可能低估了具有较大射流视角的来源的质量。我们为黑洞质量确定提出了一种新方法，其中获得的质量为$ 10^8-10^{10} \; m _ {\ odot} $。环境压力振幅值的值范围指向我们样品中源的均匀培养基条件，暂定表明FRII源周围的压力较高。
We use the observed jet boundary transition from parabolic to conical shape, which was earlier discovered as possibly a common effect in active galactic nuclei, to estimate a black hole, a jet and an ambient medium parameters. We explained earlier the geometry transition as a consequence of a change in the jet inner properties: a transition from a magnetically dominated to an equipartition regime. This interpretation allows us to estimate a black hole spin, a black hole mass and an ambient pressure amplitude, using the observed jet shape break position and the jet width at the transition point for 11 active galactic nuclei. The black hole spin values obtained using our method are consistent with the lower estimates for the sources with redshift $z<2$ from the spin evolution modelling. We find that the method of a black hole mass determination based on the relation between the broad-line region size and its luminosity may underestimate masses of the sources with large jet viewing angles. We propose a new method for the black hole mass determination, with the obtained masses being in interval $10^8-10^{10}\;M_{\odot}$. The range of the values of the ambient pressure amplitude points to the uniform medium conditions for the sources in our sample, with a tentative indication of higher pressure around FRII sources.
