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Radio-loud quasars are quasars with powerful jets that are strong sources of radio-wavelength emission. These make up about 10% of the overall quasar population. [62] Radio-quiet quasars are those quasars lacking powerful jets, with relatively weaker radio emission than the radio-loud population. The majority of quasars (about 90%) are radio-quiet.
The source of OQ 172 has a radio spectrum characterized by its spectral peak in the gigahertz domain, making it a gigahertz-peaked spectrum quasar (GPS) [5] [6] or a compact steep spectrum source (CSS). [7] OQ 172 contains a core-jet structure with the radio core itself located in the northern region of the radio emission. [8]
first radio-"star" found to be at a high redshift with a non-stellar spectrum. First radio-quiet quasar QSO B1246+377 1965 The first radio-quiet quasi-stellar objects (QSO) were called Blue Stellar Objects or BSO, because they appeared like stars and were blue in color. They also had spectra and redshifts like radio-loud quasi-stellar radio ...
Its spectrum did not resemble that of any normal stars with typical stellar elements. 3C 273 was the first object to be identified as a quasar—an extremely luminous object at an astronomical distance. 3C 273 is a radio-loud quasar, and was also one of the first extragalactic X-ray sources discovered in 1970. However, even to this day, the ...
PKS 0438-436, also known as PKS J0440-4333, is a quasar located in constellation Caelum.With a high redshift of 2.86, [1] the object is located 11.2 billion light-years from Earth [2] and is classified as a blazar due to its flat-spectrum radio source, [3] (in terms of the flux density as (F v ~ V-a) with α < 0.5 and its optical polarization.
PKS 1127-145 is a radio-loud quasar [1] located in the constellation of Crater. This is a Gigahertz Peaked Spectrum object [2] [3] with a redshift of (z) 1.187, [4] first discovered by astronomers in 1966. [5] Its radio spectrum appears to be flat making it a flat-spectrum radio quasar, or an FRSQ in short. [6] [7]
The visible light spectrum of PKS 0405–385 displays strong, broad emission lines, with an intermediate absorption occurring at a redshift of 0.875. [6] Examination using VLBI shows the radio source spans less than five microarcseconds (μas) in angle. [7]
An optically violent variable quasar (often abbreviated as OVV quasar) is a type of highly variable quasar. It is a subtype of blazar that consists of a few rare, bright radio galaxies, whose visible light output can change by 50% in a day. [ 2 ]