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5.7 Irr II Galaxies

Systems such as M82, NGC 520, and the companion to M51 (Atlas, p. 26; and plate 4 here) were often classified as peculiar by Hubble. This group represents a more restricted definition than that given by Arp (1966). As defined here, Irr II galaxies have an amorphous texture of the luminous form (M82: Atlas, p. 41; NGC 3077: Atlas, p. 41) and fall outside the standard system. Although peculiar, they should be distinguished from those galaxies whose peculiarities are caused by tidal interactions.