News From the Field
Distant Blazar Is a High-energy Astrophysics Puzzle
April 18, 2013
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.
University of California, Santa Cruz
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