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Luminous Infrared Galaxy

(a galaxy emitting a lot of far-infrared light)

A Luminous Infrared Galaxy (LIRG) is a Galaxy emitting more than 1011 times solar Luminosity in the Far Infrared.

They are often a Starburst Galaxy and/or have an Active Galactic Nucleus or a Quasar. The relatively high infrared stems from Dust heated by the Electromagnetic Radiation (EMR) of the AGN or Star Formation (SF), re-emitting the EMR in a cooler (infrared-intensive) Black Body spectrum, that can exceed the directly-viewed Emission from the star formation or AGN. Generally, the higher the IR, the higher the Star Formation Rate (SFR). LIRGs are among the brightest objects in the universe. Variations:

(galaxy type,infrared)

Referenced by:
Hyperluminous Infrared Galaxy (HLIRG)
Ultraluminous Infrared Galaxy (ULIRG)