Neutrines in ice underline the source of cosmic radiation |

Cosmic radiation is difficult to observe and measure. It consists of charged particles moving through a powerful magnetic field, which makes it impossible to track where it comes from. With cosmic radiation, however, neutrons, uncharged massless elementary particles that can pass through space are, in principle, unaffected.

This is a neutrino, with an energy of about 300 TeV, which was identified and reassembled at its source by the IceCube telescope on the South Pole, a blazar. A blazar is a giant elliptical galaxy with a center of a solid, fast-spinning black hole, called TXS 0506 + 056 and located about 4 billion light-years from the ground

Cosmic Radiation of Galaxies Giants

Researchers from Stockholm University and the University of Uppsala, among others, have identified a likely source from where cosmic radiation is formed by the earth. The discovery was made with the IceCube neutrino telescope at the South Pole and observations from 20 different telescopes around the world.

– In September of last year, IceCube captured a very high energy neutrino and alarmed other telescopes. At the same time, NASA's Fermi satellite and the MAGIC telescope in the Canary Islands saw an active galactic eruption several billion light-years away in the same direction as the neutrino, explains Chad Finley of Physics, Stockholm University.

Chad Finley facilitated the analysis of earlier IceCube data and found dozens of neutrons from the same direction. They are therefore further evidence that there is a link between high energy enrichers and this active galaxy.

– Blazars – and more generally active galaxies – seem to act as the most extreme particle accelerators in nature "

] IceCube is a neutrino telescope located a few kilometers from the South Pole ice and funded by the National Science Foundation of the US state, but also by Germany, Sweden and Belgium as well as by seven other countries. Swedish funding comes from the Swedish Research Council. The collaboration includes 320 researchers from nearly 50 institutions around the world. The University of Stockholm, along with Uppsala University and three other universities, founded the South Pole's first neutrino telescope in 1992.

Study
The results are published in the scientific journal Science of an International Research Team with Chad Finley of the University of Stockholm and Olga Botner of the University of Uppsala. More information on the study and copies of the articles are available at http://www.eurekalert.org/jrnls/sci.

Contact§19659011]Chad Finley, Associate Professor of Physics, Stockholm University, [email protected]. see, 08-55 37 87 57 (connected to a mobile).