D. Makarov, I. D. Karachentsev, J. N. Chengalur, R. Uklein, A. Marchuk
We report on discovery of unique binary system of dIr galaxies which looks like a low surface brightness tidal stream in the halo of another dwarf galaxy. Both the galaxies are detected in the HI line with the Giant Metrewave Radio Telescope (GMRT). The pair components have absolute blue magnitudes -16.0 and -13.2, heliocentric radial velocities 1799 and 1842 km/s, and hydrogen masses-to-luminosity ratios 0.4 and 1.6 in solar units, respectively. The binary system is characterized by a high orbital mass-to-luminosity ratio of 49 in solar units and a short crossing time of 0.22 Gyr.
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http://arxiv.org/abs/1303.2477
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