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Last week, the Event Horizon Telescope collaboration released their
image of the supermassive black hole at the centre of our Galaxy.
Sagittarius A was the name given to the brightest radio source
in the constellation of Sagittarius, and when higher angular
resolution revealed that source contained several components,
Sgr A* was the name given to the brightest, which coincides with
the centre of the Milky Way.
The Event Horizon Telescope used the technique of Very Long Baseline
Interferometry and high frequency of 230 GHz (wavelength of 1.3mm)
to achieve the angular resolution required to see the shadow the
the black hole.
This result follows earlier results from the EHT Collaboration
for M87 and
for Centaurus A.
There are articles in The Conversation explaining
how the team made this image and
why it is such a big deal.
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