Cosmic rays from transrelativistic supernovae

Ran Budnik, Boaz Katz, Andrew MacFadyen, Eli Waxman

    Research output: Contribution to journalArticle

    Abstract

    We derive constraints that must be satisfied by the sources of ∼10 15 to ∼1018eV cosmic rays, under the assumption that the sources are Galactic. We show that while these constraints are not satisfied by ordinary supernovae (SNe), which are believed to be the sources of ≲1015 eV cosmic rays, they may be satisfied by the recently discovered class of transrelativistic supernovae (TRSNe), which were observed in association with gamma-ray bursts. We define TRSNe as SNe that deposit a large fraction, fR > 10-2, of their kinetic energy in mildly relativistic, γβ > 1, ejecta. The high-velocity ejecta enable particle acceleration to ∼1018 eV, and the large value of f R (compared to fR ∼ 10-7 for ordinary SNe) ensures that if TRSNe produce the observed ∼1018 eV cosmic-ray flux, they do not overproduce the flux at lower energies. This, combined with the estimated rate and energy production of TRSNe, imply that Galactic TRSNe may be the sources of cosmic rays with energies up to ∼1018 eV.

    Original languageEnglish (US)
    Pages (from-to)928-933
    Number of pages6
    JournalAstrophysical Journal
    Volume673
    Issue number2
    DOIs
    StatePublished - Feb 1 2008

    Fingerprint

    cosmic ray
    supernovae
    cosmic rays
    ejecta
    kinetic energy
    energy
    particle acceleration
    gamma ray bursts
    deposits

    Keywords

    • Acceleration of particles
    • Cosmic rays
    • Gamma rays: bursts
    • Supernova remnants
    • Supernovae: general

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Budnik, R., Katz, B., MacFadyen, A., & Waxman, E. (2008). Cosmic rays from transrelativistic supernovae. Astrophysical Journal, 673(2), 928-933. https://doi.org/10.1086/524923

    Cosmic rays from transrelativistic supernovae. / Budnik, Ran; Katz, Boaz; MacFadyen, Andrew; Waxman, Eli.

    In: Astrophysical Journal, Vol. 673, No. 2, 01.02.2008, p. 928-933.

    Research output: Contribution to journalArticle

    Budnik, R, Katz, B, MacFadyen, A & Waxman, E 2008, 'Cosmic rays from transrelativistic supernovae', Astrophysical Journal, vol. 673, no. 2, pp. 928-933. https://doi.org/10.1086/524923
    Budnik R, Katz B, MacFadyen A, Waxman E. Cosmic rays from transrelativistic supernovae. Astrophysical Journal. 2008 Feb 1;673(2):928-933. https://doi.org/10.1086/524923
    Budnik, Ran ; Katz, Boaz ; MacFadyen, Andrew ; Waxman, Eli. / Cosmic rays from transrelativistic supernovae. In: Astrophysical Journal. 2008 ; Vol. 673, No. 2. pp. 928-933.
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