Flat-spectrum radio quasars (FSRQs) as a research area encompass the observational and theoretical study of a subclass of blazars characterized by powerful relativistic jets aligned close to the line of sight and exhibiting flat radio spectra (spectral index ≳ −0.5). Research focuses on their broadband spectral energy distributions from radio to γ-rays, jet composition and dynamics, particle acceleration and radiation mechanisms (synchrotron and inverse Compton), variability and polarization behavior, and their role in cosmic evolution of active galactic nuclei. FSRQs also serve as laboratories for testing jet–disk coupling, black hole growth, high-energy astrophysics, and contributions to extragalactic γ-ray and neutrino backgrounds.
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