Black hole image ‘most direct proof of their existence’

PARIS: The first photograph of a black hole and its fiery halo, released Wednesday by Event Horizon Telescope astronomers, is the “most direct proof of their existence,” one of the project’s lead scientists told AFP.

Frederic Gueth, deputy director of the Institute for Millimetric Radio Astronomy (IRAM in Grenoble, France, talked about the ground-breaking exploit and the science behind it.

“What we see in the image is the shadow of the black hole’s rim — known as the event horizon, or the point of no return — set against the luminous accretion disk.

“The event horizon is a bit smaller (in diameter than the shadow. The black hole itself is within the event horizon.

“Our observations revealed that the supermassive black hole in the galaxy M87 has a mass 6.5 billion times greater than the Sun, and that it turns clockwise.”

What’s next?

“Because it worked so well in 2017, when the observations were made, we are clearly going to do it again!

“The EHT will continue to evolve in the coming years, notably with the addition of two new telescopes: the NOEMA telescope in the French Alps, and the Greenland Telescope.

“The picture from the M87 galaxy emphatically confirms the models we have of rotating black holes. We are seeing exactly what the models predicted. That is satisfying.

“The challenge now will be to measure the exact density of the matter around a black hole, and to better understand the crucial role of magnetic fields, and how matter within the accretion disk rotates.”