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We use Chandra X-ray observations of the hot gas in and around NGC6868 andNGC6861 in the Telescopium galaxy group (AS0851) to probe the interactionhistory between these galaxies. Mean surface brightness profiles for NGC6868and NGC6861 are each well described by double beta-models, suggesting that theyare each the dominant galaxy in a galaxy subgroup about to merge. Surfacebrightness and temperature maps of the brightest group galaxy NGC6868 show acold front edge ~23 kpc to the north, and a cool 0.62 keV spiral-shaped tail tothe south. Analysis of the temperature and density across the cold frontconstrains the relative motion between NGC6868 and the ambient group gas to beat most transonic; while the spiral morphology of the tail strongly suggeststhat the cold front edge and tail are the result of gas sloshing due to thesubgroup merger. The cooler central region of NGC6861 is surrounded by a sheathof hot gas to the east and hot, bifurcated tails of X-ray emission to the westand northwest. We discuss supersonic infall of the NGC6861 subroup, sloshingfrom the NGC6868 and NGC6861 subgroup merger, and AGN heating as possibleexplanations for these features, and discuss possible scenarios that maycontribute to the order of magnitude discrepancy between the Margorrian andblack hole mass - sigma predictions for its central black hole.

The Mysterious Merger of NGC6868 and NGC6861 in the Telescopium Group