ScienceDaily: Cosmic Rays News |
| Distant blazar is a high-energy astrophysics puzzle Posted: 18 Apr 2013 09:57 AM PDT Blazars are the brightest of active galactic nuclei, and many emit very high-energy gamma rays. New observations of the blazar known as PKS 1424+240 show that it is the most distant known source of very high-energy gamma rays, but its emission spectrum now appears highly unusual in light of the new data. |
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