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DDO 68: A flea with smaller fleas that on him prey

We present new photometry of the dwarf irregular galaxy DDO 68, one of the most metal-poor and least massive dwarfs, located in the Lynx-Cancer Void. The images were acquired with the Large Binocular Telescope in the g and r passbands, and show unequivocally that DDO 68 has previously unknown stellar streams related to the accretion of at least two smaller companions: a flea with smaller fleas biting it, to put it in Jonathan Swift's words. Our data provide direct observational evidence of multiple merging occurring at very low galactic mass scales. We present the results of an N-body simulation of the interaction of three dwarf galaxies which reproduces well the main morphological features of DDO 68.

preprint2016arXivOpen access
F. AnnibaliC. NipotiL. CiottiM. TosiA. AloisiM. BellazziniM. CignoniF. CusanoD. ParisE. Sacchi
astro-ph.GA
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F. AnnibaliC. NipotiL. CiottiM. TosiA. AloisiM. BellazziniM. CignoniF. CusanoD. ParisE. Sacchi

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