Although not Seyfert galaxies, line widths greater than 10,000 kilometers per second characterize the broad line region of these objects.
The spectra of these objects feature a "big blue bump" in the UV to optical region. Although not Seyfert galaxies, line widths greater than 10,000 kilometers per second characterize the broad line region of these objects. These objects can be used to determine the time of the reionization era because their spectra contain many absorption lines in the Lyman-alpha forest, which is absorbed by neutral hydrogen to create a Gunn-Peterson trough. Observation of two of these objects provided the first direct evidence for gravitational lensing. These objects are powered by an accretion disc around a supermassive black hole. For 10 points, identify these very luminous active galactic nuclei that are normally classified as either "radio-quiet" or "radio-loud".
The spectra of these objects feature a "big blue bump" in the UV to optical region.
quasars [or quasi-stellar radio sources; or quasi-stellar objects; or QSOs; accept double quasars or double QSOs; or active galactic nuclei; or AGN]