Implication of Spin Constraints by the Event Horizon Telescope on Stellar Orbits in the Galactic Center

@article{Fragione2022ImplicationOS,
  title={Implication of Spin Constraints by the Event Horizon Telescope on Stellar Orbits in the Galactic Center},
  author={Giacomo Fragione and Abraham Loeb},
  journal={The Astrophysical Journal Letters},
  year={2022},
  volume={932}
}
The center of the Milky Way hosts the closest supermassive black hole, Sgr A*. Decades of near-infrared observations of our Galactic Center have shown the presence of a small population of stars (the so-called S-star cluster) orbiting Sgr A*, which were recently reported to be arranged into two orthogonal disks. In this case, the timescale for the Lense–Thirring precession of S stars should be longer than their age, implying a low spin for Sgr A*. In contrast, the recent results by the Event… 
Observation of S4716—a Star with a 4 yr Orbit around Sgr A*
The ongoing monitoring of the Galactic center and Sgr A*, the central supermassive black hole, produces surprising and unexpected findings. This goes hand in hand with the technical evolution of

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