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Swift Survey Finds 'Missing' Active Galaxies


Swift Survey Finds 'Missing' Active Galaxies

  • Categoría Astronomía
  • Seen in X-rays, the entire sky is aglow. Even far away from bright sources, X-rays originating from beyond our galaxy provide a steady glow in every direction. Astronomers have long suspected that the chief contributors to this cosmic X-ray background were dust-swaddled black holes at the centers of active galaxies. The trouble was, too few of them were detected to do the job.