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We present Australia Telescope Compact Array (ATCA) observations of agalaxy-sized intergalactic HI cloud (the Vela Cloud) in the NGC 3256 galaxygroup. The group contains the prominent merging galaxy NGC 3256, which issurrounded by a number of HI fragments, the tidally disturbed galaxy NGC 3263,and several other peculiar galaxies. The Vela Cloud, with an HI mass of 3-5 *10**9 solar masses, resides southeast of NGC 3256 and west of NGC 3263, withinan area of 9' x 16' (100 kpc x 175 kpc for an adopted distance of 38 Mpc). Inour ATCA data the Vela Cloud appears as 3 diffuse components and contains 4density enhancements. The Vela Cloud's properties, together with its groupenvironment, suggest that it has a tidal origin. Each density enhancementcontains ~10**8 solar masses of HI gas which is sufficient material for theformation of globular cluster progenitors. However, if we represent theenhancements as Bonnor-Ebert spheres, then the pressure of the surrounding HIwould need to increase by at least a factor of 6 in order to cause the collapseof an enhancement. Thus we do not expect them to form massive bound stellarsystems like super star clusters or tidal dwarf galaxies. Since the HI densityenhancements have some properties in common with High Velocity Clouds, weexplore whether they may evolve to be identified with these starless cloudsinstead.

The Vela Cloud: A Giant HI Anomaly in the NGC 3256 Group