Direct time radio variability induced by non-axisymmetric standing accretion shock instability: implications for M87

Abstract

We show for the first time the direct time variable radio images in the context of shocked accretion flows around a black hole under the general relativistic treatment of both hydrodynamics and radiation transfer. Time variability around a black hole can be induced by the non-axisymmetric standing accretion shock instability (namely Black Hole SASI). Since the spiral arm shock waves generate the density and temperature waves at the post shock region, they cause time variability in the black hole vicinity. Based on our dynamical simulations, we discuss a possibility of detection for the time variable radio images of M87 by the future space telescope VSOP2/ASTRO-G satellite. The most luminous part of the images is predicted to be near 15 Schwarzschild radii for some snapshots. We show that our results are consistent with existing observational data such as timeaveraged radio spectra, VLBA images and variability timescale for M87. We also discuss observations of M87 with millimeter and sub-millimeter interferometers.

17 pages, 5 figures, Accepted to publication for ApJ

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Cited by in corpus (7)

• 230 GHz VLBI observations of M87: event-horizon-scale structure at the enhanced very-high-energy $\gamma$-ray state in 2012
• Magnetization degree at the jet base of M87 derived from the event horizon telescope data: Testing magnetically driven jet paradigm
• Effects of the composition on transonic properties of accretion flows around black holes
• Multi-Epoch VERA Observations of Sagittarius A*: I. Images and Structural Variability
• Semi-dynamical approach to the shock revival in core-collapse supernovae
• Constraining the size of the dark region around the M87 black hole by space-VLBI observations
• High Resolution Imaging of a Black Hole Shadow with Millimetron Orbit around Lagrange Point L2