The discovery of the source of cosmic rays in the Milky...

ComplexGMT 18:09 30.08.2021Copy the link

Almost a century ago, scientists discovered that some of the radiation that hits the Earth’s atmosphere is not from the sun, but rather cosmic radiation that comes from the Milky Way.

Cosmic rays are high-energy protons and atomic nuclei stripped of their electrons and subjected to very large accelerations, reaching speeds close to the speed of light, and despite their discovery a century ago, the mysteries still surround the source of these rays until today.
A new research has been revealed by Japan’s Nagoya University, about the source of cosmic rays produced in the Milky Way for the first time in history.

وبحسب ScienceAlert, a scientific journal, helps to Solving a mystery that has baffled scientists for more than 100 years is a major step towards accurately determining the source of cosmic rays.

Scientists previously believed that cosmic rays originate from many sources, such as the sun, supernovae and gamma ray bursts (GRBs) and their exact origin has been a mystery since it was first discovered in 1912.

Astronomers hypothesize that supernova remnants (after-effects of supernova explosions) are responsible for their acceleration to nearly the speed of light.

In recent years, improved observations have led some scientists to speculate that supernova remnants are giving rise to cosmic rays because the protons they speed up interact with other protons in space to form high-energy gamma rays (VHE).

The research team, who Include members from Nagoya University, the National Astronomical Observatory of Japan (NAOJ), and the University of Adelaide in Australia, the remnants of the gamma-carrying supernova (RX J1713), and the key to their research was the new approach they developed to determine the source of gamma rays in interstellar space.
The observations showed that the intensity of VHE gamma rays from protons colliding with other protons in the universe is proportional to the density of interstellar gas, which can be distinguished using radio linear imaging.

The team relied on the data that Obtained for the high-energy stereo system (HESS), data from the Observatory VHE gamma rays located in Namibia (It is administered by the Max Planck Institute for Nuclear Physics).

They combined this with X-ray data obtained by the European Space Agency’s X-ray Multiplex Mirror (XMM-Newton) observatory and data showing the distribution of gas in the interstellar medium.

Research results indicated that gamma rays emitted by protons are more common in gas-rich regions between star clusters, while those emitted by electrons are scattered in gas-poor regions.

Professor Emeritus Yasuo Fukui, lead author of the study, said: “This new method could not have been achieved without international cooperation. It will be applied to more supernova remnants using the Next Generation Gamma Ray Telescope (CTA) in addition to existing observatories, which will serve to provide Great support for the study of the origin of cosmic rays.”





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