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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                    2022 June 5   
      
                         Two Black Holes Dancing in 3C 75   
        Image Credit: X-Ray: NASA/CXC/D. Hudson, T. Reiprich et al. (AIfA);   
                               Radio: NRAO/VLA/ NRL   
      
      Explanation: What's happening at the center of active galaxy 3C 75? The   
      two bright sources at the center of this composite x-ray (blue)/ radio   
      (pink) image are co-orbiting supermassive black holes powering the   
      giant radio source 3C 75. Surrounded by multimillion degree x-ray   
      emitting gas, and blasting out jets of relativistic particles the   
      supermassive black holes are separated by 25,000 light-years. At the   
      cores of two merging galaxies in the Abell 400 galaxy cluster they are   
      some 300 million light-years away. Astronomers conclude that these two   
      supermassive black holes are bound together by gravity in a binary   
      system in part because the jets' consistent swept back appearance is   
      most likely due to their common motion as they speed through the hot   
      cluster gas at about 1200 kilometers per second. Such spectacular   
      cosmic mergers are thought to be common in crowded galaxy cluster   
      environments in the distant universe. In their final stages, the   
      mergers are expected to be intense sources of gravitational waves.   
      
                       Tomorrow's picture: Milky Way doomed   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                                & Michigan Tech. U.   
      
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