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Schlagwörter:
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Zusammenfassung:
Supermassive binary black holes (SBBHs) are considered to be a natural result of hierarchical galaxy mergers, yet phenomenological evidence for the existence of close (separation d < 0.1 pc) SBBHs, that are able to coalesce within a Hubble time, still remains ambiguous. Here we show that low-frequency (f < 10^{-6} Hz) quasi-periodic variability observed from (jet-aligned) radio-loud AGNs can provide substantial inductive support for the presence of close SBBHs at their centers: It is argued on physical grounds that such close binary systems are likely to give rise to different (although not independent) periodicities in the radio, optical and X-ray/TeV regime, and, hence that detection of appropriate period ratios significantly corroborates the SBBH interpretation.
