Particles such as these have been detected previously in supernova remnants and pulsar nebulae.
One source of high-energy neutrinos is likely to be supernova remnants, such as the Crab Nebula.
They reveal their youth by sitting right in the middle of supernova remnants that have yet to fade away.
Both these supernova remnants are strong sources of the type of gamma rays one would expect from neutral pion decay.
The first is that not all supernova remnants (which are often visible as glowing nebulae, such as the Crab nebula) have pulsars inside them.
Observing neutrinos from supernova remnants would confirm this suggestion, since neutrinos of the right energy would be signs of protons being accelerated to the speeds of cosmic rays.
Well the asymmetrical spread of matter suggests it was ejected from the top and bottom of the star faster than elsewhere, unlike typical supernova remnants that leave symmetrical patterns.
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Indeed, the conference heard of still more supernova remnants that had been declared free of detectable radio pulsars and also of a few previous associations between remnants and pulsars that have turned out to be false.
"It takes thousands of years for supernova remnants to evolve, but with this nova we've watched the same kinds of changes over just a few days, " said Kent Wood, a co-author on the Science study from the Naval Research Laboratory in Washington, DC.
There are no records of such a supernova, and no visible remnants of such a supernova, either.
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Then those findings were later reviewed, the old location pinpointed, and the remnants of a supernova found.
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In a recent paper, Dr Jacobson argues that observations made of synchrotron radiation produced by the Crab nebula (the remnants of a supernova observed in 1054) limit the granularity of space.
Like detectives inspecting the scene of a bank heist, astrophysicists carefully study supernovae remnants for the clues they provide to the supernova explosion itself, hundreds of years ago.
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