Evolution Of Active Galactic Nuclei, And Its Central Black Hole Mass

In this paper, we briefly introduced the basic properties of active galactic nuclei (AGN_S). We also comprehensively summarized the fundamental characteristic of each kind. On the basis of 405 collected AGN_S samples, here we have adopted three different methods to analyse the masses of the super massive black hole. They included: the reverberation mapping method, the stellar velocity method, and the short time scale method. At the same time, we have calculated the central emission region of active galactic nuclei by means of the short time scale method. The result indicatedthat: the scale of black hole mass is 10⁶ -+ 10^9.9 M_? ; The scale of emission regionis 10^-5 -10^-2 pc. Meanwhile, as the accretion rate is an important parameter of theAGN_S' evolution, this paper also discussed the calculation of accretion rate, which scale is 0.001 ≤ m≤1.Through these results, I mainly built the relation between accretion rate and the masses of black hole, as well as the relation between accretion rate and the bolometric luminosity. Through these works, I have made an initial statistical research for the AGN_S evolution. From these analyses, we found that the black hole masses and the luminosity of AGN_S change with the development of accretion rate. Then we found that the transformation from Quasar to Seyfert galaxy is so obvious that we could easily find the relation between them. Since the evolution essential of AGN_S is the change on the timescales of the universe, and the redshift plays an important role in the evolution of AGNs, we also discussed the relation between the redshift and the masses of black hole, as well as the relation between the redshift and the bolometric luminosity. Through their relations, on one hand, it was clear for us that the redshift could indicate the position of AGNs in the timescales of the universe, and on the other hand, it could further prove the course of the evolution of AGNs. Finally these results testified that the evolution of AGN_S could be divided into two sequences. One is from...