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High-frequency quasi-periodic oscillations (QPOs) appear ingeneral-relativistic magnetohydrodynamic simulations of magnetically chokedaccretion flows around rapidly rotating black holes (BHs). We perform polarizedradiative transfer calculations with ASTRORAY code to explore themanifestations of these QPOs for SgrA*. We construct a simulation-based modelof a radiatively inefficient accretion flow and find model parameters byfitting the mean polarized source spectrum. The simulated QPOs have a totalsub-mm flux amplitude up to 5% and a linearly polarized flux amplitude up to2%. The oscillations reach high levels of significance 10-30\sigma and highquality factors Q~5. The oscillation period T~100M~35min corresponds to therotation period of the BH magnetosphere that produces a trailing spiral inresolved disk images. The total flux signal is significant over noise for alltested frequencies 87GHz, 230GHz, and 857GHz and inclination angles 10deg,37deg, and 80deg. The non-detection in the 230GHz Sub-Millimeter Array lightcurve is consistent with a low signal level and a low sampling rate. Thepresence of sub-mm QPOs in SgrA* will be better tested with the Atacama LargeMillimeter Array.

Submillimeter Quasi-Periodic Oscillations in Magnetically Choked Accretion Flows Models of Sgr A*