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   CHRS: LATIN-1 2   
                           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 March 30   
      
                           Animation: Odd Radio Circles   
        Credits: Illustration: Sam Moorfield; Data: CSIRO, HST (HUDF), ESA,   
                                       NASA;   
         Image: J. English (U. Manitoba), EMU, MeerKAT, DES (CTIO); Text:   
                                  Jayanne English   
      
      Explanation: What do you call a cosmic puzzle that no one expected to   
      see? In this case, Odd Radio Circles, aka ORCs. ORC-1 typifies the   
      enigmatic five objects, only visible at radio frequencies, that were   
      serendipitously discovered in 2019 using the new Australian SKA   
      Pathfinder radio array. The final image in the featured video uses 2021   
      data from the South African MeerKAT array to reveal more detail. The   
      radio data, assigned turquoise colors, are combined with a Dark Energy   
      Survey optical/IR map. The animated artistCÇÖs illustration explores just   
      one idea about the ORCsCÇÖ origins. If two supermassive black holes merge   
      in the center of a galaxy, the associated shockwaves could generate   
      rings of radio radiation. These grow to fill the video frame. The video   
      zooms out so the expansion the ORC can be tracked until it is about a   
      million light-years across. Fortunately, the up-coming Square Kilometer   
      Array can help test this and other promising scenarios.   
      
                          Tomorrow's picture: open space   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC   
                                & Michigan Tech. U.   
      
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