ultraluminous infrared galaxy

ultraluminous infrared galaxy

[¦əl·trə¦lü·mə·nəs ‚in·frə‚rəd ′gal·ik·sē]
(astronomy)
One of a class of galaxies that emit intense radiation at infrared wavelengths, 100 times or more as much as the Milky Way Galaxy. Abbreviated ULIRG.
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"IRAS 14348-1447 is one of the most gas-rich examples known of an ultraluminous infrared galaxy, a class of cosmic objects that shine characteristically - and incredibly - brightly in the infrared part of the spectrum," ESA said in a (https://www.nasa.gov/image-feature/hubbles-front-row-seat-when-galaxies-collide) statement accompanying the image.
At a distance of 250 million light-years from Earth, Arp 220 represents the nearest example of an ultraluminous infrared galaxy. "It is of crucial importance to understand the origin, nature, and ultimate fate of the activity in the ultraluminous infrared galaxies because they are an important constituent of the local universe," the researchers write.