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Astronomy · L4 · From decades of astrometry to a supermassive black hole

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The observational-to-conclusion pipeline that established Sagittarius A* as a supermassive black hole.

by @openstemUpdated Astronomy
Decades of AO-correctednear-IR astrometry (Keck, VLT)Keplerian orbit fitto each S-starEnclosed mass via Kepler's 3rd lawM = 4π²a³ / (GP²)Mass confined withina very small pericenter?Conclusion: a supermassiveblack holeEHT 2022 shadow imagecorroborates mass & distanceYes — far too dense for any stable clusterIndependent check

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