Event Horizon Telescope
(growing VLBI network)
The Event Horizon Telescope (EHT) is
an initiative to use radio telescopes around the world
to study the supermassive black hole, Sagittarius A*
at the galactic center of the Milky Way,
using Earth-sized VLBI,
with the goal of resolving the black hole's event horizon.
A second black hole, M87*
(at the center of galaxy M87) is also a target.
Images are collected once a year when the geometry is right
to view the targets. The goal is baselines in multiple directions
on the order of 12000km, as large as can be done from the ground,
and appropriate telescopes are recruited toward reaching this goal.
The first image was taken in 2006 and the first
image succeeding in detecting one of the black hole shadows
(of M87*) was taken in 2018 and announced in 2019
after analysis of the image revealed the shadow.
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|666μm||450GHz||1.9meV||begin||Event Horizon Telescope|
|1.4mm||230GHz||951μeV||end||Event Horizon Telescope|
Greenland Telescope (GLT)
very-long-baseline interferometry (VLBI)