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We investigate the relationship between 5 GHz interstellar scintillation(ISS) and 15 GHz intrinsic variability of compact, radio-selected AGNs drawnfrom the Microarcsecond Scintillation-Induced Variability (MASIV) Survey andthe Owens Valley Radio Observatory (OVRO) blazar monitoring program. Wediscover that the strongest scintillators at 5 GHz (modulation index, $m_5 \geq0.02$) all exhibit strong 15 GHz intrinsic variability ($m_{15} \geq 0.1$).This relationship can be attributed mainly to the mutual dependence ofintrinsic variability and ISS amplitudes on radio core compactness at $\sim100\, \mu$as scales, and to a lesser extent, on their mutual dependences onsource flux density, arcsec-scale core dominance and redshift. However, not allsources displaying strong intrinsic variations show high amplitudescintillation, since ISS is also strongly dependent on Galactic line-of-sightscattering properties. This observed relationship between intrinsic variabilityand ISS highlights the importance of optimizing the observing frequency,cadence, timespan and sky coverage of future radio variability surveys, suchthat these two effects can be better distinguished to study the underlyingphysics. For the full MASIV sample, we find that Fermi-detected gamma-ray loudsources exhibit significantly higher 5 GHz ISS amplitudes than gamma-ray quietsources. This relationship is weaker than the known correlation betweengamma-ray loudness and the 15 GHz variability amplitudes, most likely due tojet opacity effects.

The MASIV Survey IV: relationship between intra-day scintillation and intrinsic variability of radio AGNs