The black hole at the centre of our own galaxy is imaged

Assembled from 42 blocks · 1 evidence · 26 related

1. Story
2. The Event Horizon Telescope published an image of Sagittarius A* showing a ring about 51.8 microarcseconds across, from the same April 2017 campaign that produced the M87* result three years earlier. The delay was caused by the source itself: with a mass roughly fifteen hundred times smaller than M87*, its material orbits in minutes, so the structure changed during the observation and standard imaging methods smeared it. The recovered ring size matches the prediction from the mass measured by watching stars orbit - two independent methods agreeing on one object.
3. Knowledge
4. The photon sphere and the shadow
5. Sagittarius A* - the black hole at the centre of the Milky Way
6. S2 - the star that measured the Galactic centre
7. Event Horizon Telescope
8. The black hole at the centre of our own galaxy is imaged
9. Connections
10. Sagittarius A* - the black hole at the centre of the Milky Way
11. Event Horizon Telescope
12. The photon sphere and the shadow
13. S2 - the star that measured the Galactic centre
14. M87* - the supermassive black hole in Messier 87
15. S2 - the star that measured the Galactic centre
16. A star is tracked through a complete close approach to the Galactic centre
17. The Event Horizon Telescope observes M87* and Sagittarius A*
18. S2 passes pericentre and its light is measurably redshifted
19. The orbit of S2 is shown to precess as general relativity predicts
20. The Nobel Prize in Physics recognises black holes twice over
21. The black hole at the centre of our own galaxy is imaged
22. The Event Horizon Telescope observes M87* and Sagittarius A*
23. Very long baseline interferometry
24. Atacama Large Millimeter/submillimeter Array
25. South Pole Telescope
26. The Event Horizon Telescope observes M87* and Sagittarius A*
27. The first image of a black hole shadow is published
28. The M87* ring is imaged in polarised light
29. The black hole at the centre of our own galaxy is imaged
30. A second epoch shows the ring persists and the bright spot moves
31. Schwarzschild radius
32. The first image of a black hole shadow is published
33. The black hole at the centre of our own galaxy is imaged
34. A second epoch shows the ring persists and the bright spot moves
35. Sagittarius A* - the black hole at the centre of the Milky Way
36. A star is tracked through a complete close approach to the Galactic centre
37. S2 passes pericentre and its light is measurably redshifted
38. The orbit of S2 is shown to precess as general relativity predicts
39. The Nobel Prize in Physics recognises black holes twice over
40. The black hole at the centre of our own galaxy is imaged
41. Evidence
42. Reports an image of Sagittarius A* with a ring diameter of about 51.8 microarcseconds, consistent with the mass derived from stellar orbits, and describes the variability that made the imaging difficult. V55 VERIFICATION BASIS: not consulted in session; no research tool was available. Volume and article number are from recall and must be checked.