Luminous Infrared Galaxies (LIRGs) are galaxies that emit a significant portion of their energy in the infrared spectrum, typically having luminosities greater than 10^{11} L☉, where L☉ is the luminosity of the Sun. These galaxies are often characterized by intense star formation activity, which is fueled by gas and dust, leading to the rapid production of stars. This vigorous starburst activity results in large amounts of dust that absorb the visible light and re-emit it as infrared radiation.
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