The interacting subsystems theory of active galactic nuclei - I. The broad-absorption-line QSO theory

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Scientific paper

The theory of broad-absorption-line (BAL) QSOs is worked out on the basis of the radiation hydrodynamics equation solution for the two-phase media of active galactic nuclei. We suppose that the BAL QSO physics depends on some `hidden' AGN parameters, such as the mass and size of the compact stellar system. We therefore approach this problem in the more general framework of the `interacting subsystems theory', which includes these parameters. We compare the results of the numerical model calculations with the observed spectra and show that the BAL QSOs (and the radio-quiet quasars as well) contain massive compact stellar kernels in their central regions. We show that the line-locking effect is determined by the radiation pressure, and is also favoured by the drag force of the hot gas acting on the line-absorbing clouds. We derive some general conclusions about the physics of AGN. In particular, we show that the radio-quiet versus radio-loud dichotomy can be explained by using two types of hot gas outstreams in quasars.

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