The early stage of a cosmic collision? XMM-Newton unveils two obscured   AGN in the galaxy pair ESO509-IG066
  We report the XMM-Newton discovery of a X-ray bright AGN pair in the interacting galaxy system ESO509-IG066. Both galaxies host an X-ray luminous (L_X ~10^{43} erg/s) obscured nucleus with column densities N_H~7x10^{22} and N_H~5x10^{21} atoms/cm/cm. The optical morphology is only mildly disturbed, suggesting a merging system in the early stage of its evolution. Still, the pair is probably gravitationally bound, and might eventually evolve into a compact, fully gas embedded systems such as NGC6240. 
M.Guainazzi (1), E.Piconcelli (1), E.Jimenez-Bailon (1), G.Matt (2)   ((1) European Space Astronomy Center, Villafranca del ...