Generation of 1015-1017 eV photons by ultrahigh-energy cosmic rays in the galactic magnetic field

S. L. Dubovsky, P. G. Tinyakov

    Research output: Contribution to journalArticle

    Abstract

    It is shown that the expected dip in the diffuse photon spectrum above the threshold of e+e- pair production, i.e., at energies 1015-1017 eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic ultrahigh-energy cosmic rays (UHE CRs) in the Galactic magnetic field. The mechanism we propose requires small (<2 × 10-12 G) extragalactic magnetic fields and a large photon fraction in the UHE CRs. For a typical photon flux expected in top-down scenarios of UHE CRs, the predicted flux in the region of the dip is close to the existing experimental limit. The sensitivity of our mechanism to the extragalactic magnetic field may be used to improve existing bounds on the latter by two orders of magnitude.

    Original languageEnglish (US)
    Pages (from-to)495-501
    Number of pages7
    JournalJETP Letters
    Volume70
    Issue number8
    StatePublished - Oct 25 1999

    Fingerprint

    interstellar magnetic fields
    cosmic rays
    photons
    pair production
    magnetic fields
    energy
    synchrotron radiation
    thresholds
    sensitivity
    electrons

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Generation of 1015-1017 eV photons by ultrahigh-energy cosmic rays in the galactic magnetic field. / Dubovsky, S. L.; Tinyakov, P. G.

    In: JETP Letters, Vol. 70, No. 8, 25.10.1999, p. 495-501.

    Research output: Contribution to journalArticle

    Dubovsky, S. L. ; Tinyakov, P. G. / Generation of 1015-1017 eV photons by ultrahigh-energy cosmic rays in the galactic magnetic field. In: JETP Letters. 1999 ; Vol. 70, No. 8. pp. 495-501.
    @article{2b5b1f0fe2fd4f8ca2570a22870a8845,
    title = "Generation of 1015-1017 eV photons by ultrahigh-energy cosmic rays in the galactic magnetic field",
    abstract = "It is shown that the expected dip in the diffuse photon spectrum above the threshold of e+e- pair production, i.e., at energies 1015-1017 eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic ultrahigh-energy cosmic rays (UHE CRs) in the Galactic magnetic field. The mechanism we propose requires small (<2 × 10-12 G) extragalactic magnetic fields and a large photon fraction in the UHE CRs. For a typical photon flux expected in top-down scenarios of UHE CRs, the predicted flux in the region of the dip is close to the existing experimental limit. The sensitivity of our mechanism to the extragalactic magnetic field may be used to improve existing bounds on the latter by two orders of magnitude.",
    author = "Dubovsky, {S. L.} and Tinyakov, {P. G.}",
    year = "1999",
    month = "10",
    day = "25",
    language = "English (US)",
    volume = "70",
    pages = "495--501",
    journal = "JETP Letters",
    issn = "0021-3640",
    publisher = "Maik Nauka-Interperiodica Publishing",
    number = "8",

    }

    TY - JOUR

    T1 - Generation of 1015-1017 eV photons by ultrahigh-energy cosmic rays in the galactic magnetic field

    AU - Dubovsky, S. L.

    AU - Tinyakov, P. G.

    PY - 1999/10/25

    Y1 - 1999/10/25

    N2 - It is shown that the expected dip in the diffuse photon spectrum above the threshold of e+e- pair production, i.e., at energies 1015-1017 eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic ultrahigh-energy cosmic rays (UHE CRs) in the Galactic magnetic field. The mechanism we propose requires small (<2 × 10-12 G) extragalactic magnetic fields and a large photon fraction in the UHE CRs. For a typical photon flux expected in top-down scenarios of UHE CRs, the predicted flux in the region of the dip is close to the existing experimental limit. The sensitivity of our mechanism to the extragalactic magnetic field may be used to improve existing bounds on the latter by two orders of magnitude.

    AB - It is shown that the expected dip in the diffuse photon spectrum above the threshold of e+e- pair production, i.e., at energies 1015-1017 eV, may be absent due to the synchrotron radiation by the electron component of the extragalactic ultrahigh-energy cosmic rays (UHE CRs) in the Galactic magnetic field. The mechanism we propose requires small (<2 × 10-12 G) extragalactic magnetic fields and a large photon fraction in the UHE CRs. For a typical photon flux expected in top-down scenarios of UHE CRs, the predicted flux in the region of the dip is close to the existing experimental limit. The sensitivity of our mechanism to the extragalactic magnetic field may be used to improve existing bounds on the latter by two orders of magnitude.

    UR - http://www.scopus.com/inward/record.url?scp=0038957407&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0038957407&partnerID=8YFLogxK

    M3 - Article

    VL - 70

    SP - 495

    EP - 501

    JO - JETP Letters

    JF - JETP Letters

    SN - 0021-3640

    IS - 8

    ER -