[Todos] Fwd: Invisibles21: today's talk: 4 June 2021 - 17:30 CEST —> Andrea Ghez (UCLA, Nobel Laureate in Physics 2020)

[Secretaria de Física]

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-------- Mensaje original -------- 

 		ASUNTO:
 		Invisibles21: today's talk: 4 June 2021 - 17:30 CEST --> Andrea Ghez
(UCLA, Nobel Laureate in Physics 2020)

 		FECHA:
 		2021-06-04 08:39

 		REMITENTE:
 		Ernesto Arganda Carreras <ernesto.arganda en csic.es>

 		DESTINATARIO:
 		Secretaria del Dpto.de Física <secre2 en fisica.unlp.edu.ar>

Para enviar a [Todos], ¡gracias!

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Andrea Ghez (UCLA, NOBEL LAUREATE IN PHYSICS 2020) "Our Galactic Center:
A Unique Laboratory for the Physics & Astrophysics of Black Holes", 4
June 2021 - 17:30 CEST.

Abstract:  

The proximity of our Galaxy's center presents a unique opportunity to
study a galactic nucleus with orders of magnitude higher spatial
resolution than can be brought to bear on any other galaxy. After more
than a decade of diffraction-limited imaging on large ground-based
telescopes, the case for a supermassive black hole at the Galactic
center has gone from a possibility to a certainty, thanks to
measurements of individual stellar orbits. The rapidity with which these
stars move on small-scale orbits indicates a source of tremendous
gravity and provides the best evidence that supermassive black holes,
which confront and challenge our knowledge of fundamental physics, do
exist in the Universe. This work was made possible through the use of
speckle imaging techniques, which corrects for the blurring effects of
the earth's atmosphere in post-processing and allowed the first
diffraction-limited images to be produced with these large ground-based
telescopes. 

Further progress in high-angular resolution imaging techniques on large,
ground- based telescopes has resulted in the more sophisticated
technology of adaptive optics, which corrects for these effects in real
time. This has increased the power of imaging by an order of magnitude
and permitted spectroscopic study at high resolution on these telescopes
for the first time. With adaptive optics, high resolution studies of the
Galactic center have shown that what happens near a supermassive back
hole is quite different than what theoretical models have predicted,
which changes many of our notions on how galaxies form and evolve over
time. By continuing to push on the cutting-edge of high-resolution
technology, we have been able to capture the orbital motions of stars
with sufficient precision to test Einstein's General theory of
Relativity in a regime that has never been probed before.

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-- 
Ernesto Arganda
High Performance Computing, Machine Learning and AI Group
Instituto de Física Teórica UAM-CSIC
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Campus de Cantoblanco UAM
28049 Madrid - Spain
Phone: (+34) 912 999 854
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Cell: (+34) 662 485 319
E-mail: ernesto.arganda en csic.es
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