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- W2088604799 abstract "Blazar subclasses ranging from flat-spectrum radio quasars (FSRQs) through low-frequency-peaked BL Lac objects (LBLs) to high-frequency-peaked BL Lac objects (HBLs) exhibit a sequence of increasing spectral hardness with decreasing luminosity that cannot be explained solely by orientation effects. Using an analytic model for the synchrotron, synchrotron self-Compton, and Compton-scattered external radiation from blazar jets, we propose an evolutionary scenario that links these blazar subclasses in terms of a reduction of the black hole accretion power with time. As the circumnuclear material accretes to fuel the central engine, less gas and dust are left to scatter accretion-disk radiation and produce an external Compton-scattered component in blazar spectra. This evolutionary trend produces the sequence FSRQ → LBL → HBL. Such a scenario may also link radio-loud AGNs with ultraluminous infrared galaxies and optical quasars, if the latter constitute the high-Eddington-ratio epoch of supermassive black hole growth, as suggested by the observed anticorrelation between radio and soft X-ray activity in some Galactic black hole candidates." @default.
- W2088604799 created "2016-06-24" @default.
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- W2088604799 date "2002-01-01" @default.
- W2088604799 modified "2023-10-16" @default.
- W2088604799 title "An Evolutionary Scenario for Blazar Unification" @default.
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- W2088604799 doi "https://doi.org/10.1086/324134" @default.
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