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An important subpopulation of quasistellar objects(QSOs or quasars) is formed by the quasistellar radio sources (QSRs), the radio-loud QSOs.
QSO - (quasistellar object) like quasar but not necessarily a strong radio source. By typical definitions, 90% of QSOs are radio-quiet.
Radio galaxies - strong radio sources, may be core- or lobe-dominated.
1960 - Allan Sandage optically studies 3C48 and observes an unusual blue quasistellar object,
1962 - Cyril Hazard, M.B. Mackey, and A.J.
 See also: Light, Emission, Emission Line, Galaxies, Quasar
  
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