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Atelier INTERCOS - Sources des Rayons Cosmiques Galactiques, Énigmes et Avancées Récentes

2 mars 2022
APC
Fuseau horaire Europe/Paris

Liste des Contributions

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  1. 1. Bienvenue !
    Claire Guépin (IAP), Denis Allard (APC CNRS/Paris7), Pierre Cristofari (GSSI)
    02/03/2022 09:00
  2. 2. L'origine des rayons cosmiques - On the origin of Galactic cosmic rays
    Vincent Tatischeff (CSNSM)
    02/03/2022 09:15

    By using recent measurements of the Galactic cosmic ray composition by the AMS-02, Voyager 1 and SuperTIGER experiments, we have obtained new information on the origin of these energetic particles: they are most likely produced in superbubbles of plasma at millions of degrees that form around massive star clusters. Most of the cosmic-ray particles are accelerated in strong shock waves induced...

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  3. 3. Can superbubbles accelerate PeV protons?
    Thibault Vieu
    02/03/2022 10:00

    The local cosmic ray spectrum as well as recent gamma-ray observations suggest the existence of galactic sources able to accelerate protons up to at least several PeV, if not tens of PeV. However, these sources are still to be identified. In particular, standard scenarios of particle acceleration, e.g. at supernova remnant shocks around isolated massive stars, struggle to reach PeV bands. On...

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  4. 6. The contribution of supernova remnants to the cosmic ray spectrum
    Pierre Cristofari (GSSI)
    02/03/2022 11:15

    The role played by supernova remnants in the origin of Galactic cosmic rays is still unclear. Although they have been proposed as major contributor to the cosmic ray spectrum up to the knee, this hypothesis is facing several difficulties.

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  5. 5. Discussion - part 1
    02/03/2022 12:00
  6. 4. Gamma-ray observations of Galactic cosmic-ray sources
    Justine Devin (LUPM)
    02/03/2022 13:30

    Gamma rays allow us to probe the cosmic-ray acceleration sites in the Galaxy, and in particular to search for PeVatrons through the detection of the pion bump feature and an energy reached by particles up to PeV energies. Although supernova remnants (SNRs) have long been thought to be the most likely sources of Galactic cosmic rays, gamma-ray analyses show that even the youngest SNRs do not...

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  7. 7. On the origin of the GCR composition, in the light of the Ne22 excess
    Nikos Prantzos (IAP Paris)
    02/03/2022 14:15

    I will discuss the source composition of GCR and the implications for their acceleration site, emphasizing the role of the observed Ne22/Ne20 excess and the observed evolution of the light elements Li, Be and B , produced by GCR spallation reactions.

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  8. 8. Multiwavelength studies of the interstellar contents of gamma-ray bright supernova remnants
    Pierre Dell'Ova
    02/03/2022 15:30

    In the era of the Cherenkov Telescope Array, gamma-ray observations of supernova remnants (SNRs) will be performed with increased sensitivity and angular resolution, resulting in an unprecedented volume of data. Thorough interpretations of these new gamma-ray spectra will require to accurately quantify the interaction of cosmic rays with the complex interstellar environment of SNRs. Our goal...

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  9. 9. Discussion - part 2
    02/03/2022 16:15