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[[Uppsala General Catalogue|UGC]] 9913,<ref name="ned" /> [[Principal Galaxies Catalogue|PGC]] 55497<ref na Luminous far-infrared objects like Arp 220 have been found in surprisingly large numbers by sky surveys o ...

...t fit into any of the above categories are listed as objects 332–338. Most objects are best known by their other designations, but a few galaxies are best kno ...galaxies in the atlas. A few other galaxies are [[radio galaxies]]. These objects contain [[active galactic nuclei]] that produce powerful jets of gas called ...