SIMBAD references

We have conducted wide-field Hi mapping of a ∼5.5x5.5-deg² region surrounding the NGC 3783 galaxy group, to an Hi mass limit of ∼4x10⁸M_☉. The observations were made using the multibeam system on the Parkes 64-m radiotelescope, as part of the Galaxy Evolution Multiwavelength Study. We find twelve Hi detections in our Parkes data, four more than catalogued in Hi Parkes All Sky Survey (HIPASS). We find two new group members, and discover an isolated region of Hi gas with an Hi mass of ∼4x10⁸M_☉, without a visible corresponding optical counterpart. We discuss the likelihood of this Hi region being a low surface brightness galaxy, primordial gas, or a remnant of tidal debris. For the NGC 3783 group we derive a mean recession velocity of 2903±26km/s, and a velocity dispersion of 190±24km/s. The galaxy NGC 3783 is the nearest galaxy to the luminosity-weighted centre of the group, and is at the group mean velocity. From the X-ray and dynamical state of this galaxy group, this group appears to be in the early stages of its evolution.