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G. Fabbiano, A. Zezas, S. S. Murray (SAO)
We report the results of a deep {\em Chandra} ACIS pointing at the merging system NGC 4038/39. We detect an extraordinarily luminous population of X-ray sources, with luminosity well above that of XRBs in M31 and the Milky Way. If these sources are unbeamed XRBs, our observations may point to 10-100~M\odot black hole counterparts. We detect an X-ray bright hot ISM, with features ranging from bright superbubbles associated with the actively star-forming knots, to a large-scale outflow.