12/28/2023 0 Comments Event horizon telescope team andrew![]() ![]() But within the central region, there should be an inner shadow. It’s just a shadow of the black hole caused by the photon ring. The dark central region of the M87* image isn’t that of the event horizon. If we can pull apart these layers, we will better understand the nature of gravity near a black hole.Īnd, as a recent paper on the arXiv shows, the ngEHT could also help us probe a black hole’s event horizon itself. Each type of photon path creates a different layer of light ring around the black hole. But some light will make a full loop around the black hole before heading our way, and a small amount will make multiple loops. That is, the strongly lensed light that grazed the black hole. Most of the light we see surrounding the black hole is that of the photon ring. One of the things the ngEHT could reveal is multiple layers of lensed light. ![]() Credit: George Wong (UIUC) and Michael Johnson (CfA) This will allow detailed images not just of M87*, but also of the supermassive black hole in our galaxy.ĭifferent photon paths create layers of light. But the next generation EHT will have a higher resolution and will be able to capture images in a shorter period of time. Some of the light from the photon ring is scattered before it reaches us, and combined with the resolution limits of the EHT this creates the blurred image we see. If we could observe the black hole perfectly, the photon ring would be a thin bright line. The closest limit that light can graze the black hole and reach us is known as the photon ring. Some of that light passes very close to the black hole and is gravitationally lensed in our direction. The glowing ring we see in the EHT image of M87* is caused by the background radio glow of gas and dust surrounding the black hole. Any light that crosses its event horizon is forever trapped. Credit: Center for Astrophysics, Harvard & SmithsonianĪ black hole doesn’t emit light itself. How strongly lensed light creates a photon ring. ![]()
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