Testing the correlations between ultrahigh energy cosmic rays and the Veron-Cetty and Veron catalogue of quasars and active galactic nuclei

Ingyin Zaw, Glennys R. Farrar, Andreas A. Berlind

    Research output: Contribution to journalArticle

    Abstract

    We investigate several aspects of the correlations reported by the Pierre Auger Observatory between the highest energy ultra-high energy cosmic rays (UHECRs) and galaxies in the Veron-Cetty Veron (VCV) catalogue of active galactic nuclei (AGNs). First, we quantify the extent of the inhomogeneity and impurity of the VCV catalogue. Second, we determine how the correlation between the highest energy Auger UHECRs and VCV galaxies is modified when only AGNs satisfying optical spectral line ratios, i.e. a very pure sample, are used. Finally, we measure the correlation between the published Auger UHECRs and the distribution of nearby galaxies. We find that the correlation between the arrival directions of published Auger UHECRs and the VCV AGNs is much stronger than the correlation with the random sets of galaxies drawn from nearby large-scale structure. This suggests that the correlation of the UHECRs with AGNs is not solely due to AGNs tracing the large-scale distribution of matter. We also find that once we take into account the heavy oversampling of the VCV catalogue in the Virgo region, the lack of UHECRs from that region is not incompatible with UHECRs having AGN sources.

    Original languageEnglish (US)
    Pages (from-to)263-272
    Number of pages10
    JournalMonthly Notices of the Royal Astronomical Society
    Volume410
    Issue number1
    DOIs
    StatePublished - Jan 2011

    Fingerprint

    active galactic nuclei
    cosmic ray
    quasars
    catalogs
    cosmic rays
    energy
    galaxies
    tracing
    inhomogeneity
    arrivals
    line spectra
    observatories
    observatory
    impurities

    Keywords

    • Cosmic rays
    • Galaxies: active

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Testing the correlations between ultrahigh energy cosmic rays and the Veron-Cetty and Veron catalogue of quasars and active galactic nuclei. / Zaw, Ingyin; Farrar, Glennys R.; Berlind, Andreas A.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 410, No. 1, 01.2011, p. 263-272.

    Research output: Contribution to journalArticle

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