Magnetics Business & Technology - January/February 2025 - 19

RESEARCH & DEVELOPMENT
Sgr A*. "
To observe Sgr A*, the collaboration linked eight telescopes
around the world to create a virtual Earth-sized telescope, the
EHT. The Atacama Large Millimeter/submillimeter Array (ALMA),
in which ESO is a partner, and the ESO-hosted Atacama Pathfinder
Experiment (APEX), both in northern Chile, were part of the
network that made the observations, conducted in 2017.
Comparison of the sizes of two black holes: M87* and Sagittarius A*
imaging was even possible. Some models were far too scrambled
and turbulent to construct a polarised image, but Nature was not
so cruel. "
Mariafelicia De Laurentis, EHT Deputy Project Scientist and
professor at the University of Naples Federico II, Italy, said, " With
a sample of two black holes - with very different masses and very
different host galaxies - it's important to determine what they
agree and disagree on. Since both are pointing us toward strong
magnetic fields, it suggests that this may be a universal and perhaps
fundamental feature of these kinds of systems. One of the
similarities between these two black holes might be a jet, but while
we've imaged a very obvious one in M87*, we've yet to find one in
" As the largest and most powerful of the telescopes in the EHT,
ALMA played a key role in making this image possible, " says
ESO's María Díaz Trigo, European ALMA Programme Scientist.
" ALMA is now planning an 'extreme makeover', the Wideband
Sensitivity Upgrade, which will make ALMA even more sensitive
and keep it a fundamental player in future EHT observations of
Sgr A* and other black holes. "
The EHT has conducted several observations since 2017 and is
scheduled to observe Sgr A* again in April 2024. Each year, the
images improve as the EHT incorporates new telescopes, larger
bandwidth, and new observing frequencies. Planned expansions
for the next decade will enable high-fidelity movies of Sgr A*, may
reveal a hidden jet, and could allow astronomers to observe similar
polarisation features in other black holes. Meanwhile, extending
the EHT into space would provide sharper images of black
holes than ever before.
For more information see www.eso.org
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Magnetics Business & Technology - January/February 2025

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