Supermassive binary black holes among cosmic gamma-ray sources |
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Authors: | Frank M Rieger |
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Institution: | (1) UCD School of Mathematical Sciences, University College Dublin, Belfield, Dublin 4, Ireland |
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Abstract: | Supermassive binary black holes (SBBHs) are a natural outcome of galaxy mergers. Here we show that low-frequency (f≤10−6 Hz) quasi-periodic variability observed from cosmic blazar sources can provide substantial inductive support for the presence
of close (d≲0.1 pc) 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. This is illustrated for a binary model where
optical longterm periodicity is related to accretion disk interactions, radio periodicity to Newtonian jet precession, and
periodicities in the high energy bands to the orbital motion of the jet. We use the observed periodicities to constrain the
properties for a sample of SBBH candidates including OJ 287 and AO 0235+16, and discuss the results within the context of
jet activity and binary evolution. |
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Keywords: | Supermassive binary black holes Periodicity Active galaxies |
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