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    gamma-ray tagged posts

    Astronomers confirm Star Wreck as Source of Extreme Cosmic Particles

    August 15, 2022, Categories  Astronomy/Space

    This sequence compares Fermi results in three energy ranges. Pulsar J2229+6114 is the brilliant source at the top, the northern tip of supernova remnant G106.3+2.7 (outlined in green). In each energy range, the sequence first shows the number of gamma rays and then the excess amounts compared with expectations from a model of the background. Brighter colors indicate greater numbers of gamma rays or excess amounts. At the highest energies, a new source of gamma rays emerges, produced when protons accelerated by the supernova’s shock wave strike a nearby gas cloud.
    Credit: NASA/Fermi/Fang et al. 2022

    Astronomers have long sought the launch sites for some of the highest-energy protons in our galaxy...

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    Unveiling a Century-old Mystery: Where the Milky Way’s Cosmic Rays come from

    August 26, 2021, Categories  Astronomy/Space

    Astronomers have succeeded for the first time in quantifying the proton and electron components of cosmic rays in a supernova remnant. At least 70% of the very-high-energy gamma rays emitted from cosmic rays are due to relativistic protons, according to the novel imaging analysis of radio, X-ray, and gamma-ray radiation. The acceleration site of protons, the main components of cosmic rays, has been a 100-year mystery in modern astrophysics, this is the first time that the amount of cosmic rays being produced in a supernova remnant has been quantitatively shown and is an epoch-making step in the elucidation of the origin of cosmic rays.

    The origin of cosmic rays, the particles with the highest energy in the universe, has been a great mystery since their discovery in 1912...

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