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

Abstract

High-frequency quasi-periodic oscillations (QPOs) appear in general-relativistic magnetohydrodynamic simulations of magnetically choked accretion flows around rapidly rotating black holes (BHs). We perform polarized radiative transfer calculations with ASTRORAY code to explore the manifestations of these QPOs for SgrA*. We construct a simulation-based model of a radiatively inefficient accretion flow and find model parameters by fitting the mean polarized source spectrum. The simulated QPOs have a total sub-mm flux amplitude up to 5% and a linearly polarized flux amplitude up to 2%. The oscillations reach high levels of significance 10-30σand high quality factors Q~5. The oscillation period T~100M~35min corresponds to the rotation period of the BH magnetosphere that produces a trailing spiral in resolved disk images. The total flux signal is significant over noise for all tested frequencies 87GHz, 230GHz, and 857GHz and inclination angles 10deg, 37deg, and 80deg. The non-detection in the 230GHz Sub-Millimeter Array light curve is consistent with a low signal level and a low sampling rate. The presence of sub-mm QPOs in SgrA* will be better tested with the Atacama Large Millimeter Array.

7 pages, 5 figures, accepted to ApJ Letters, a movie of QPOs can be found at http://www.youtube.com/watch?v=NIMOFCtQDxQ

References in corpus (10)

• X-ray Properties of Black-Hole Binaries
• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• An Unambiguous Detection of Faraday Rotation in Sagittarius A*
• The Submillimeter Bump in Sgr A* from Relativistic MHD Simulations
• The Magnetic Rayleigh-Taylor Instability in Three Dimensions
• A polarised infrared flare from Sagittarius A* and the signatures of orbiting plasma hotspots
• A 200-s Quasi-Periodicity Following the Tidal Disruption of a Star by a Dormant Black Hole
• Light Curves from an MHD Simulation of a Black Hole Accretion Disk
• Self-consistent spectra from radiative GRMHD simulations of accretion onto Sgr A*
• General Relativistic Flux Modulations from Disk Instabilities in Sagittarius A*

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• Two-Temperature GRRMHD Simulations of M87
• Probing the magnetic field structure in Sgr A* on Black Hole Horizon Scales with Polarized Radiative Transfer Simulations
• A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating
• Transient jet formation and state transitions from large-scale magnetic reconnection in black hole accretion discs
• Radiation from rapidly rotating oblate neutron stars
• The Effects of Accretion Flow Dynamics on the Black Hole Shadow of Sagittarius A${}^{\ast }$
• General purpose ray-tracing and polarized radiative transfer in General Relativity
• Radiative Properties of Magnetically-Arrested Disks
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• Electromagnetic vs. Lense-Thirring alignment of black hole accretion discs
• Jet Signatures in the Spectra of Accreting Black Holes
• Viscous Driving of Global Oscillations in Accretion Discs Around Black Holes
• Time Domain Filtering of Resolved Images of Sgr A*
• Observational Signatures of Mass-Loading in Jets Launched by Rotating Black Holes
• Measuring the Direction and Angular Velocity of a Black Hole Accretion Disk via Lagged Interferometric Covariance