Chesnok N. Photometrical and spectral variability of emission of active galactic nucleus in the optical and X-ray.

The thesis deals with the study of photometrical and spectral variability of emission of active galactic nucleus in the optical and X-ray. As a result of a study of the photometric properties of the sample of Seyfert galaxies NGC 5548, NGC 7469, NGC 3227, NGC 4051, NGC 4151, Mrk 509, Mrk 1979, Ark 564 was establishing a relation between the characteristics of the light curves in the optical and X-ray and the presence of correlation between these ranges. Two objects of the sample, namely NGC 5548 and NGC 4051, have a great probability of the existence of a positive time delay between flow changes in the optical versus X-rays (about 97%) with the coefficient of correlation r = 73% and time delay 2.8 days for NGC 5548 and r = 36%, with time delay 2.1 days for NGC 4051. For the first time was obtained the mass of the central black hole of the Seyfert galaxies 1E 0754 +3928, M = 1.05x10 ^ 8 Msun, using the reverberation method, that helped define the position of the galaxy on the ''BH mass-luminosity'' diagram. The position of the Seyfert galaxy 1E 0754+3928 on the ''BH mass-luminosity'' diagram is in agreement with the positions of other NLS1 type galaxies on this diagram. This result confirms the theory of high accretion rate in the central source of objects with a relatively small value of the central BH masses and correspondingly with a higher temperature of the accretion disk. The sample of 62 isolated galaxies containing active nuclei was formed based on the new 2MIG catalogue. Their general properties were analyzed to determine the effect of galaxy environment on the activity of its nucleus. Preliminary analysis showed that the content of Seyfert galaxies of type 1 only 25%. It means that the environment of the galaxy may be one of the influencing factors of the formation of the BLR.