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Giant Metrewave Radio Telescope (GMRT) HI observations, done as part of anongoing study of dwarf galaxies in the Lynx-Cancer void, resulted in thediscovery of a triplet of extremely gas rich galaxies located near the centreof the void.The triplet members SDSS J0723+3621, J0723+3622 and J0723+3624 haveabsolute magnitudes M_B of -14.2, -11.9 and -9.7 and M(HI)/L_B of \sim 2.9, ~10and ~25, respectively. The gas mass fractions, as derived from the SDSSphotometry and the GMRT data are 0.93, 0.997, 0.997 respectively. The faintestmember of this triplet SDSS J0723+3624 is one of the most gas rich galaxiesknown. We find that all three galaxies deviate significantly from theTully-Fisher relation, but follow the baryonic Tully-Fisher relation. All threegalaxies also have a baryon fraction that is significantly smaller than thecosmic baryon fraction. For the largest galaxy in the triplet, this is incontradiction to numerical simulations. The discovery of this very unique dwarftriplet lends support to the idea that the void environment is conducive to theformation of galaxies with unusual properties. These observations also providefurther motivation to do deep searches of voids for a "hidden" very gas-richgalaxy population with M_B > -11.

Discovery of an extremely gas-rich dwarf triplet near the center of the Lynx-Cancer void