Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..393k&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Physics
Scientific paper
By analog with observations in microquasars (μQSO) which in different time intervals may be in different states with radically distincting properties a hypothesis is considered that the diversity of AGN types reflects state-to state transitions of objects. But, if in μQSOs the transition of state takes hundreds or seconds to continue, in AGNs this transition takes the time span longer by a factor of M [AGN]/M [μQSO] = 3 x 10 8 M[o]/10M[o] ≈ 10 7, i.e. 10 3-4 years. This is why different states of an AGN are regarded as different types of AGN. "Physical drivers parameters" responsible for changes in the AGN state may be the accretion rate and the configuration of an accreting flow which determine the condition of an accretion around-nucleus disk; the degree of disk magnetization and the direction of its rotation relative to the direction rotation of a massive BH; the density of soft quanta at which, due to compton scattering, relativistic particles responsible for synchrotron radiation are cooling; less important "main" parameter is also the M [BH] which grows with evolution. Approximately that sequence may be written asRL QSO →[←] RL BL Lac/RQ BL Lac [←]→[ ] RQ QSO.
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