Numerous subclasses of AGN have been defined on the basis of their observed characteristics; the most powerful AGN are classified as quasars. A blazar is an AGN with a jet pointed toward the Earth, in which radiation from the jet is enhanced by relativistic beaming. Quasar 3C 273 observed by the Hubble Space Telescope.

A quasar (/ ˈ k w eɪ z ɑːr / KWAY-zar) is an extremely luminous active galactic nucleus (AGN). It is sometimes known as a quasi-stellar object, abbreviated QSO. The emission from an AGN is powered by accretion onto a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous ...

May 4, 2006 · This review discusses the basic characteristics of the jets in active galactic nuclei (AGN). It concentrates on the highly relativistic variety found in blazars, since these are the closest cousins to the jets seen in some X-ray binaries (microquasars) and the collimated, ultra-fast flows inferred

In some cases, the black hole also generates huge jets of matter, which stream out at nearly the speed of light. Some jets stretch several times farther than the size of the host galaxy. What an AGN looks like in our telescopes depends on the angle we’re viewing it.

Some different types of active galaxies are: Radio Galaxies, Seyfert Galaxies, BL Lac Objects (also known as Blazars), and Quasars. This gamma-ray picture of the active galaxy PKS0528 shows large changes over only 3 months of observations.

Active galactic nucleus (AGN), small region at the centre of a galaxy that emits a prodigious amount of energy in the form of radio, optical, X-ray, or gamma radiation or high-speed particle jets. Many classes of “active galaxies” have been identified—for example, quasars, radio galaxies, and

A quasar/AGN is a system in which accretion onto a super- massive black hole produces copious amounts of non-stellar radiation over theentire electromagnetic spectrum

Dec 22, 2021 · We discovered the jet collimation break around 10^ {7} Schwarzschild radii, providing the first compelling evidence for structural transition in a quasar jet. The location of the collimation break for 3C 273 is farther downstream the sphere of gravitational influence (SGI) from the central SMBH.

Dec 8, 2022 · In this article, we confine ourselves to jets in radio galaxies and quasars with more emphasis on radio observations, summarizing our current understanding and discussing future work.

These are collectively referred to as active galactic nuclei (AGN). Indeed, a class of galaxies originally studied by C. Seyfert show the unusual quasar-like feature of emission lines from their centres.