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.
By analyzing the data from various space observatories and ground-based telescopes, European astronomers have performed a multiwavelength study of a bright gamma-ray blazar known as S5 1044+71. The new study, published Feb. ...
An international team of astronomers has analyzed the data from long-term multiwavelength monitoring of a distant blazar known as OP 313. Results of the new study, published January 18 on the arXiv preprint server, shed more ...
A study led by Dr. Xiong Dingrong of the Yunnan Observatories of the Chinese Academy of Sciences, in collaboration with other researchers, has offered new insights into the variability mechanisms of jetted active galactic ...
Astronomy
Jul 17, 2025
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One of the most powerful objects in the universe is a radio quasar—a spinning black hole spraying out highly energetic particles. Come too close to one, and you'd get sucked in by its gravitational pull, or burn up from the ...
Astronomy
Mar 31, 2025
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An international team of astronomers has observed an extremely radio-loud quasar known as J1601+3102. As a result, they found that the quasar hosts a large extended radio jet. The discovery is reported in a research paper ...
