Are galactic cosmic rays accelerated inside the ejectae expanding just after supernova explosions?

Nobuyuki Hasebe, Makoto Hareyama, Satoshi Kodaira, Kunitomo Sakurai

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Referring to the observed results on the source composition of galactic cosmic rays, a possible mechanism for the formation of this composition is proposed by taking into account the fractionation of elements in dust grains formed in the interstellar molecular clouds. These dust grains become enriched with the elements whose condensation temperature is higher than about 1000K. Most of these nuclei enhanced in the source composition are identified as heavy and ultra-heavy ones, which must have been synthesized in the r-process initiated with the explosions of type II supernovae in the OB-association. The dust grains in the superbubble are later ionized and then accelerated through their interactions with shock waves of supershell formed from multiple explosions of nearby supernovae. This may mean that cosmic rays are significantly generated from the dust grains drifting in the local interstellar space.

    Original languageEnglish
    JournalNuclear Physics A
    Volume758
    Issue number1-4 SPEC. ISS.
    DOIs
    Publication statusPublished - 2005 Jul 25

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

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