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Sgr A*: Observations, Models, and Imaging of the event horizon with VLBI

  • Heino Falcke (a1), Sera Markoff (a1), Peter L. Biermann (a1), Thomas P. Krichbaum (a1), Fulvio Melia (a2), Eric Agol (a3) and Geoffrey Bower (a4)...

Abstract

We show and discuss results and prospects of high-resolution imaging of the supermassive black hole candidate Sgr A*. We also briefly review the latest observational and theoretical progress for this source. The latest millimeter-VLBI observations show compact radio emission from within a region of about 15 Schwarzschild radii. This compact component is most likely responsible for the so-called sub-mm bump in the spectrum and perhaps even for the recently discovered circular polarization discovered up to 43 GHz and some X-ray emission through synchrotron self-Compton emission. Most importantly, however, the sub-mm emission from Sgr A* opens the door to observe, for the first time, the event horizon of a black hole directly with VLBI at sub-mm wavelengths.

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References

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Sgr A*: Observations, Models, and Imaging of the event horizon with VLBI

  • Heino Falcke (a1), Sera Markoff (a1), Peter L. Biermann (a1), Thomas P. Krichbaum (a1), Fulvio Melia (a2), Eric Agol (a3) and Geoffrey Bower (a4)...

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