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We report discovery of a dwarf galaxy in the Leo Triplet. Analysis of theneutral hydrogen distribution shows that it rotates independently of the tidaltail of NGC 3628, with a radial velocity gradient of 35-40 km s$^{-1}$ overapproximately 13 kpc. The galaxy has a very high neutral gas content,explaining large part of its total dynamic mass - suggesting small dark mattercontent. As it is located at the tip of the gaseous tail, this stronglysuggests its tidal origin. Should it be the case, it would be one of the mostconfident and closest (to the Milky Way) detections of a tidal dwarf galaxyand, at the same time, a most detached from its parent galaxy ($\approx$140kpc) object of this type.

Discovery of a tidal dwarf galaxy in the Leo Triplet