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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.   
      
                                  2024 August 23   
      
                              Supernova Remnant CTA 1   
                       Image Credit & Copyright: Thomas Lelu   
      
      Explanation: There is a quiet pulsar at the heart of CTA 1. The   
      supernova remnant was discovered as a source of emission at radio   
      wavelengths by astronomers in 1960 and since identified as the result   
      of the death explosion of a massive star. But no radio pulses were   
      detected from the expected pulsar, the rotating neutron star remnant of   
      the massive star's collapsed core. Seen about 10,000 years after the   
      initial supernova explosion, the interstellar debris cloud is faint at   
      optical wavelengths. CTA 1's visible wavelength emission from still   
      expanding shock fronts is revealed in this deep telescopic image, a   
      frame that spans about 2 degrees across a starfield in the northern   
      constellation of Cepheus. While no pulsar has since been found at radio   
      wavelengths, in 2008 the Fermi Gamma-ray Space Telescope detected   
      pulsed emission from CTA 1, identifying the supernova remnant's   
      rotating neutron star. The source has been recognized as the first in a   
      growing class of pulsars that are quiet at radio wavelengths but pulse   
      in high-energy gamma-rays.   
      
                         Tomorrow's picture: light-weekend   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
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