Atacama Large Millimeter/submillimeter Array

Assembled from 19 blocks · 1 evidence · 8 related

1. Story
2. The sixty-six-antenna millimetre and submillimetre array on the Llano de Chajnantor in northern Chile, at about five thousand metres, where the air is dry enough for observations at 1.3 millimetres to reach the ground at all. For Event Horizon Telescope observations the array is phased - its antennas combined into a single very large effective dish - which contributes the bulk of the array's sensitivity and turns marginal baselines into usable ones. The upgrade that made ALMA capable of phased VLBI is generally regarded as the step that made imaging a black hole shadow practical rather than merely conceivable, because sensitivity on the long baselines to Spain, Hawaii and the South Pole was the binding constraint.
3. Knowledge
4. Event Horizon Telescope
5. Atacama Large Millimeter/submillimeter Array
6. Connections
7. Event Horizon Telescope
8. The Event Horizon Telescope observes M87* and Sagittarius A*
9. The Event Horizon Telescope observes M87* and Sagittarius A*
10. Very long baseline interferometry
11. Atacama Large Millimeter/submillimeter Array
12. South Pole Telescope
13. The Event Horizon Telescope observes M87* and Sagittarius A*
14. The first image of a black hole shadow is published
15. The M87* ring is imaged in polarised light
16. The black hole at the centre of our own galaxy is imaged
17. A second epoch shows the ring persists and the bright spot moves
18. Evidence
19. 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.