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tokens: ACKNOWLEDGEMENTS The authors thank the referee, Dr. Leonardo J. Pellizza, for the constructive feedback provided on the manuscript. MB thanks Hai Fu for insightful discussions which helped to improve the quality of the paper. STSDAS is a product of the Space Telescope Science Institute, which is operated by AURA for NASA. We acknowlege the usage of the HyperLeda database ( http://leda.univ-lyon1.fr ). The scientific results reported in this article are based on joint observations made by the Chandra X-ray Observatory and the NASA/ESA Hubble Space Telescope . Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award No. AR7-18005X issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics and Space Administration under contract NAS8-03060.