What Does ULIRG Stand For?

ULIRG stands for Ultraluminous Infrared Galaxy

ULIRG, or Ultraluminous Infrared Galaxy, refers to a class of galaxies that emit exceptionally high levels of infrared radiation, typically exceeding 10^12 solar luminosities. These galaxies are often characterized by intense star formation and significant activity from supermassive black holes at their centers. ULIRGs are important in astrophysics as they provide insights into the processes of galaxy formation and evolution, particularly during the cosmic history when such galaxies were more prevalent. Their study helps astronomers understand the interplay between star formation, black hole activity, and the surrounding interstellar medium.