The first image of a black hole shadow is published

Assembled from 51 blocks · 2 evidence · 32 related

1. Story
2. The Event Horizon Telescope Collaboration released an image of M87* in simultaneous press conferences and a series of papers in the Astrophysical Journal Letters: an asymmetric bright ring about 42 microarcseconds across surrounding a dark centre. The dark region is the shadow cast by strong light bending near the photon sphere, not the horizon itself, and it is about two and a half times larger in diameter. The measured diameter yielded a mass of roughly six and a half billion suns, agreeing with the higher of two competing pre-existing estimates. Four imaging teams had worked independently and blind before comparing results.
3. Knowledge
4. The photon sphere and the shadow
5. Accretion disc
6. M87* - the supermassive black hole in Messier 87
7. Very long baseline interferometry
8. Event Horizon Telescope
9. The first image of a black hole shadow is published
10. Connections
11. The Event Horizon Telescope observes M87* and Sagittarius A*
12. M87* - the supermassive black hole in Messier 87
13. The photon sphere and the shadow
14. Event Horizon Telescope
15. Accretion disc
16. Very long baseline interferometry
17. Relativistic jet
18. Sagittarius A* - the black hole at the centre of the Milky Way
19. Heber Curtis records a curious straight ray in Messier 87
20. A mechanism for extracting energy from a spinning black hole
21. The Event Horizon Telescope observes M87* and Sagittarius A*
22. The first image of a black hole shadow is published
23. The M87* ring is imaged in polarised light
24. A second epoch shows the ring persists and the bright spot moves
25. Schwarzschild radius
26. The first image of a black hole shadow is published
27. The black hole at the centre of our own galaxy is imaged
28. A second epoch shows the ring persists and the bright spot moves
29. The Event Horizon Telescope observes M87* and Sagittarius A*
30. Very long baseline interferometry
31. Atacama Large Millimeter/submillimeter Array
32. South Pole Telescope
33. The Event Horizon Telescope observes M87* and Sagittarius A*
34. The first image of a black hole shadow is published
35. The M87* ring is imaged in polarised light
36. The black hole at the centre of our own galaxy is imaged
37. A second epoch shows the ring persists and the bright spot moves
38. Innermost stable circular orbit
39. Relativistic jet
40. Cygnus X-1
41. Cygnus X-1 is localised and weighed
42. Bekenstein assigns entropy to a black hole
43. The first image of a black hole shadow is published
44. The M87* ring is imaged in polarised light
45. A second epoch shows the ring persists and the bright spot moves
46. Event Horizon Telescope
47. The Event Horizon Telescope observes M87* and Sagittarius A*
48. The first image of a black hole shadow is published
49. Evidence
50. Reports the first image of a black hole shadow, an asymmetric ring about 42 microarcseconds across, together with the array, observing campaign and imaging methodology. V55 VERIFICATION BASIS: not consulted in session; WebFetch to iopscience.iop.org and eventhorizontelescope.org was refused by the egress proxy and no search could be issued. Volume and article number are from recall of a canonical citation.
51. Relates the measured ring diameter to the mass of M87*, giving approximately six and a half billion solar masses and testing the shadow prediction of general relativity. V55 VERIFICATION BASIS: not consulted in session; no research tool was available. Volume and article number are from recall; the quoted mass uncertainty is not reproduced in this pack.