Until 2004, there was no spectroscopic proof that one type of these objects contained the 10 micrometer and 18 micrometer infrared spectral features caused by silicate dust.
Until 2004, there was no spectroscopic proof that one type of these objects contained the 10 micrometer and 18 micrometer infrared spectral features caused by silicate dust. These bodies are surrounded by asymmetric toroidal structures that cause anisotropic obscuration, and the smoothness of the broad-line region in NGC 4395 suggests that the broad-line region of these objects originates from a single continuous flow. They can be classified as Type I or Type II based on the width of their spectral lines or how they are viewed, but are more commonly divided into radio-quiet and radio-loud types. Powered by an accretion disk around a supermassive black hole, for 10 points, name these compact galactic centers that emit massive amounts of electromagnetic radiation.
Until 2004, there was no spectroscopic proof that one type of these objects contained the 10 micrometer and 18 micrometer infrared spectral features caused by silicate dust.
{Active} Galactic {Nuclei} [prompt on {Seyfert galaxies} or {BL Lac objects} before {galactic centers}; prompt on {Quasars} or {Quasi}-{Stellar Radio Sources} or {Blazars}]