Discovery of a Giant Radio Fossil in the Ophiuchus Galaxy Cluster

  title={Discovery of a Giant Radio Fossil in the Ophiuchus Galaxy Cluster},
  author={Simona Giacintucci and Maxim Markevitch and Melanie Johnston-Hollitt and Daniel R. Wik and Q. S. Wang and Tracy E. Clarke},
  journal={The Astrophysical Journal},
The Ophiuchus galaxy cluster exhibits a curious concave gas density discontinuity at the edge of its cool core. It was discovered in the Chandra X-ray image by Werner and collaborators, who considered a possibility of it being a boundary of an AGN-inflated bubble located outside the core, but discounted this possibility because it required much too powerful an AGN outburst. Using low-frequency (72-240 MHz) radio data from MWA GLEAM and GMRT, we found that the X-ray structure is, in fact, a… 
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