On the correlation between radio and gamma-ray luminosities of active galactic nuclei

A. Mücke, M. Pohl

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    The possibility of a correlation between the radio (cm)- and gamma-ray luminosity of variable AGN seen by EGRET is investigated. We perform Monte-Carlo simulations of typical data sets and apply different correlation techniques (partial correlation analysis, chi(2)-test applied on flux-flux relations) in view of a truncation bias caused by sensitivity limits of the surveys. For K-corrected flux densities, we find that with the least squares method only a linear correlation can be recovered. Partial correlation analysis on the other side provides a robust tool to detect correlations even in flux-limited samples if intrinsic scatter does not exceed similar to 40 % of the original gamma-ray luminosity. However, if mean flux values of high variable sources are used we find the chance probability of high Spearman's correlation coefficient be significant underestimated. The analysis presented in this paper takes into account redshift bias and truncation effects simultaneously which was never considered in earlier papers.
    Original languageEnglish
    JournalAstronomy and Astrophysics
    Volume320
    Issue number1
    Pages (from-to)33-40
    ISSN0004-6361
    Publication statusPublished - 1997

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