Active Galaxies
- Structure: Galaxies with active nuclei that emit large amounts of energy. This activity is often due to the presence of a supermassive black hole at the center.
- Appearance: Can emit radiation across the electromagnetic spectrum, including radio, infrared, visible, ultraviolet, X-ray, and gamma rays.
- Seyfert Galaxies: Have active nuclei that emit strong emission lines in their spectra. Example: Seyfert 1 Galaxy.
- Quasars: Extremely luminous and distant active galactic nuclei, thought to be powered by supermassive black holes. Example: 3C 273.
- Blazars: Active galaxies with jets pointed towards Earth, leading to high variability and strong emissions. Example: BL Lacertae.
