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High-energy Astrophysics Puzzle

Posted April 26, 2013 10:28 AM

From SpaceRef Top Stories:

Blazars are the brightest of active galactic nuclei, and many emit very high-energy gamma rays. New observations of a 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 appears highly unusual.

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Guru

Join Date: Mar 2007
Location: at the beach in Florida
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Re: High-energy Astrophysics Puzzle

04/26/2013 10:46 AM


"PKS 2155-304 is located 1.5 billion light-years away in the southern constellation of Piscis Austrinus and is usually a detectable but faint gamma-ray source. But when its jet undergoes a major outburst, as it did in 2006, the galaxy can become the brightest source in the sky at the highest gamma-ray energies scientists can detect - up to 50 trillion times the energy of visible light. Even from strong sources, only about one gamma ray this energetic strikes a square yard at the top of Earth's atmosphere each month."

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