Recently, the shadow of supermassive black hole (BH) in M87 was detected
by the Event Horizon Telescope (EHT). This provided powerful evidence of
the presence of supermassive BH and the BH mass was estimated to be ~6.5
billion solar mass. The value of the BH spin is still uncertain, because
the BH spin weakly affects the morphology of the BH shadows. In addition,
the direct images of the accretion flow and the relativistic jet have not
yet been detected due to the current ability of the EHT. Towards the
future EHT and multi-wavelength observations from radio to gamma-ray band,
we calculate the images and multi-wavelength spectra of accretion flows and
relativistic jets of supermassive black holes including the BH shadows, in
order to constrain the BH spacetime and to reveal the dynamics of accretion
flows and relativistic jets.
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