Evidence that a cluster of UHECRs was produced by a burst or flare

Glennys R. Farrar

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The angular clustering of 5 Ultrahigh Energy Cosmic Rays (UHECRs) in the combined published AGASA-HiRes data has a probability of 2103 of occurring by chance. A first analysis of the implications of the event energies and angular spreading is presented, which is applicable if the source is close enough that GZK losses can be ignored. Under this assumption, the observed energies of the events in this cluster favor a bursting rather than continuously emitting source, with the events emitted on a time scale short compared with 300DMpc years. Assuming the UHECRs experience many incoherent small magnetic deflections enroute from source to Earth, the arrival direction distribution allows estimation that hB2iD 7.7 nG2Mpc2. If the spectrum at the source E2, the total isotropic equivalent energy emitted in UHECRs is 1043 D3 Mpc ergs.

    Original languageEnglish (US)
    Title of host publicationProceedings of the 30th International Cosmic Ray Conference, ICRC 2007
    PublisherUniversidad Nacional Autonoma de Mexico
    Pages161-164
    Number of pages4
    Volume2
    EditionOG PART 1
    StatePublished - 2007
    Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
    Duration: Jul 3 2007Jul 11 2007

    Other

    Other30th International Cosmic Ray Conference, ICRC 2007
    CountryMexico
    CityMerida, Yucatan
    Period7/3/077/11/07

    Fingerprint

    flares
    cosmic rays
    bursts
    energy
    arrivals
    deflection

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Farrar, G. R. (2007). Evidence that a cluster of UHECRs was produced by a burst or flare. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007 (OG PART 1 ed., Vol. 2, pp. 161-164). Universidad Nacional Autonoma de Mexico.

    Evidence that a cluster of UHECRs was produced by a burst or flare. / Farrar, Glennys R.

    Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. p. 161-164.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Farrar, GR 2007, Evidence that a cluster of UHECRs was produced by a burst or flare. in Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 edn, vol. 2, Universidad Nacional Autonoma de Mexico, pp. 161-164, 30th International Cosmic Ray Conference, ICRC 2007, Merida, Yucatan, Mexico, 7/3/07.
    Farrar GR. Evidence that a cluster of UHECRs was produced by a burst or flare. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. OG PART 1 ed. Vol. 2. Universidad Nacional Autonoma de Mexico. 2007. p. 161-164
    Farrar, Glennys R. / Evidence that a cluster of UHECRs was produced by a burst or flare. Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007. Vol. 2 OG PART 1. ed. Universidad Nacional Autonoma de Mexico, 2007. pp. 161-164
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