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Ramakrishnan, V; Hovatta, T; Nieppola, E; Tornikoski, M; Lähteenmäki, A; Valtaoja, E
Monthly notices of the Royal Astronomical Society, 09/2015, Volume: 452, Issue: 2Journal Article
We address the highly debated issue of constraining the γ-ray emission region in blazars from cross-correlation analysis using discrete correlation function between radio and γ-ray light curves. The significance of the correlations is evaluated using two different approaches: simulating light curves and mixed source correlations. The cross-correlation analysis yielded 26 sources with significant correlations. In most of the sources, the γ-ray peaks lead the radio with time lags in the range +20 and +690 d, whereas in sources 1633+382 and 3C 345 we find the radio emission to lead the γ-rays by −15 and −40 d, respectively. Apart from the individual source study, we stacked the correlations of all sources and also those based on subsamples. The time lag from the stacked correlation is +80 d for the whole sample and the distance travelled by the emission region corresponds to 7 pc. We also compared the start times of activity in radio and γ-rays of the correlated flares using Bayesian block representation. This shows that most of the flares at both wavebands start at almost the same time, implying a co-spatial origin of the activity. The correlated sources show more flares and are brighter in both bands than the uncorrelated ones.
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