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 Thursday, 12 Oct. 2023

    Video-Recording for any system with MP4-support

   - Video.mp4  (ca. 442 Mb)

 15:15 – 16:23


                         Manne Siegbahn Memorial Lecture 2023:

        “Imaging Supermassive Black Holes: From Still Images to Video”


                                        Prof. Sheperd Doeleman

                (Center for Astrophysics, Harvard & Smithsonian and Founding Director

                                             of the Event Horizon Telescope (EHT))



Until recently, no one had ever seen what a black hole actually

looked like. Einstein's theories predict that a distant observer should

see a ring of light encircling the black hole, which forms when radiation

emitted by infalling hot gas is lensed by the extreme gravity near the

event horizon. The Event Horizon Telescope (EHT) is a global array of

radio dishes, linked together by a network of atomic clocks to form an

Earth-sized virtual telescope that can resolve the nearest supermassive

black holes where this ring feature may be measured. On April 10th, 2019,

the EHT project reported success: through observations of the supermassive

black hole at the center of galaxy M87, we have seen the predicted strong

gravitational lensing that matches the theory of General Relativity (GR).

In 2022, observations of SgrA*, the black hole at the center of our Milky

Way galaxy, revealed a similar ring with dimensions predicted by GR. These

results have now opened the door to precision measurement of black holes

on horizon scales, and next-generation enhancements to the array allow us

to anticipate black hole movies by the end of this decade. This talk will

cover how this was accomplished, the impact, and what the future holds for

the study of black holes.


About the speaker:


Sheperd S. Doeleman is an Astrophysicist at the Center for Astrophysics,

Harvard & Smithsonian and Founding Director of the Event Horizon Telescope

(EHT), a synchronized global array of radio observatories designed to

examine the nature of black holes. He is also a Harvard Senior Research

Fellow and a Project Co-Leader of Harvard’s recently established Black

Hole Initiative. Doeleman now leads the next-generation Event Horizon

Telescope project.


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