The Event Horizon of Sagittarius A

@article{Broderick2009TheEH,
  title={The Event Horizon of Sagittarius A},
  author={A. Broderick and A. Loeb and Ramesh Narayan Cita and Harvard-Smithsonian CfA},
  journal={The Astrophysical Journal},
  year={2009},
  volume={701},
  pages={1357-1366}
}
Black hole event horizons, causally separating the external universe from compact regions of spacetime, are one of the most exotic predictions of general relativity. Until recently, their compact size has prevented efforts to study them directly. Here we show that recent millimeter and infrared observations of Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, all but require the existence of a horizon. Specifically, we show that these observations limit the… Expand
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