What type of galaxy emits an abnormally large amount of energy?

Galaxies that emit an abnormally large amount of energy are typically classified as active galactic nuclei (AGN). These galaxies contain supermassive black holes at their centers, which accrete gas and dust, releasing immense amounts of energy in the form of radiation across the electromagnetic spectrum. This makes them some of the most luminous objects in the universe, including types such as quasars and blazars. Their high-energy emissions can outshine the combined light of all their stars.