How EHT Helped Us, Better Understand Black Holes

There’s an image of a black hole that has a bright ring of emission that’s surrounding a shadow cast by the black hole.

The ring is made out of sharp subrings, which correspond to the number of orbits took around the black hole. The EHT, Event Horizon Telescope has revealed the first image of a black hole. Today, researchers have published new calculations that show a substructure in the black hole images from extreme gravitational light bending.

Michael Johnson from the Center for Astrophysics stated: “Each successive ring has about the same diameter but becomes increasingly sharper because its light orbited the black hole more times before reaching the observer. With the current EHT image, we’ve caught just a glimpse of the full complexity that should emerge in the image of any black hole.”

Due to the fact that a black hole can trap any photons which cross their event horizon, they can cast a shadow on their surrounding emissions. This photon ring surrounds the shadow, which was produced from light that is concentrated by the intense gravity that’s near the black hole. The photon ring has signs of a black hole all over it, from the size and shape to the rotation. By using the EHT images, they now have a new tool that can use to study these objects.

Einstein’s theory of general relativity comes with many predictions for these observations, and the world is bound to see a lot of advances in the future. The convergence between theory and experiment is quite rewarding, and they are looking forward to seeing more and more experiments of this kind. “This is a fascinating time to be thinking about the physics of black holes,” stated Daniel Kapec.

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