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Three years ago, a neutrino was detected in the Mediterranean Sea, near Sicily, and researchers are still trying to determine its source. I wrote a diary about the detection of this neutrino last year. Its energy was determined to be 220 peta eV, ten times more energetic than any other neutrino ever observed. The detector, which has the unfortunate name KM3NeT/ARCA, uses the water of the Mediterranean Sea as its detection medium, and its construction is still not complete. However, it was complete enough in 2023 to detect this neutrino.
The first thing that astrophysicists checked was to look back in the direction from which the neutrino came to see if there was an object emitting electromagnetic radiation (visible light, radio waves, X-rays or gamma rays) that might have been the neutrino’s source, but there was nothing obvious. As such, astrophysicist considered the possibility that the neutrino was produced by a diffuse source, that is actually from a combination of many sources than can combine by some sort of process to produce high-energy neutrinos. In a new publication, they are proposing that celestial objects called blazars may be the diffuse sources responsible. A blazar is an active supermassive black hole at the center of a galaxy whose jet is pointing directly toward Earth.
To investigate, the team used an open source simulation tool called AM3 to model realistic blazar populations. Many aspects of the simulations were based on values already measured through other observations, including magnetic field strength and the size of emission regions around the black holes.
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For every simulation, the researchers calculated both neutrino production and the related gamma ray emission, then compared the results with real observations.
The study combined observations from multiple major observatories, including KM3NeT/ARCA, the IceCube Neutrino Observatory [in Antarctica], and NASA’s Fermi Gamma-ray Space Telescope [in Earth orbit].
The researchers made sure that their simulation did not predict what has not been seen. For example, the fact that in decades of neutrino astronomy, no other neutrino has been observed to be this energetic means that such neutrinos are extremely rare. Also, they made sure that the gamma ray production matched the background observed by the Fermi gamma-ray telescope. Their simulation matched observed energetic neutrino production while obeying the imposed constraints, so a blazar may indeed be the source of that neutrino. However, it will require many more neutrino observations before blazars can be confirmed as the true source of energetic neutrinos.
On to the comments:
From ZenTrainer:
Two comments from pouncecafe‘s diary about electric cars and American consumers. amygdala, in their comment, thinks the best alternative is actually public transportation. jjohnjj observes that the concept of independent transportation is rooted deep in the American psyche.
From RostFinch:
In Walter Einenkel‘s front page story Republicans won’t ‘pass judgement’ on Trump’s corruption, JustWright provides useful information about a federal candidate from Minnesota, and encourages all of us to look down the ballot.
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