Quasar Properties Quasars have all the same properties as active galaxies, but are more powerful: their radiation is partially 'nonthermal' (i.e., not due to a black body ), and approximately 10 percent are observed to also have jets and lobes like those of radio galaxies that also carry significant (but poorly known) amounts of energy in the form of high energy (i.e., rapidly moving, close to the speed of light) particles (either electrons and protons or electrons and positrons). Quasars can be detected over the entire observable electromagnetic spectrum including radio , infrared , optical , ultraviolet , X-ray and even gamma rays . Most quasars are brightest in their rest-frame near-ultraviolet (near the 1216 angstrom (121.6 nm ) Lyman-alpha emission line of hydrogen), but due to the tremendous redshifts of these sources, that peak luminosity has been observed as far to the red as 9000 angstroms (900 nm or 0.9 µm), in the near infrared. A minority of quasars show strong radio emission, which originates from jets of matter moving close to the speed of light. When
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