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We present GMRT HI observations and deep CFHT MegaCam optical images of thegas-rich interacting galaxy group NGC 871/NGC 876/NGC 877 (hereafter NGC871/6/7). Our high-resolution data sets provide a census of the HI and stellarproperties of the detected gas-rich group members. In addition to a handful ofspiral, irregular and dwarf galaxies, this group harbours an intriguing HIfeature, AGC 749170, that has a gas mass of ~10^9.3 M_sol, a dynamical-to-gasmass ratio of ~1 (assuming the cloud is rotating and in dynamical equilibrium)and no optical counterpart in previous imaging. Our observations have revealeda faint feature in the CFHT g'- and r'-bands; if it is physically associatedwith AGC 749170, the latter has M/L_g > 1000 M_sol/L_sol as well as a highermetallicity (estimated using photometric colours) and a significantly youngerstellar population than the other low-mass gas-rich group members. Theseproperties, as well as its spectral and spatial location with respect to itssuspected parent galaxies, strongly indicate a tidal origin for AGC 749170.Overall, the HI properties of AGC 749170 resemble those of other opticallydark/dim clouds that have been found in groups. These clouds could represent aclass of relatively long-lived HI-rich tidal remnants that survive inintermediate-density environments.

An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877