Topic: Space
Astronomers can't yet measure how fast black holes spin. A new tool might help in the next few years.
Black holes are massive objects that suck up everything, including light. But astronomers know they also spin really quickly. Determining their spin speed is important to understand how they affect their surroundings.
A team of scientists led by Tegan Thomas from the University of Virginia has been studying this issue. They looked at two theories about the maximum spin speed of a black hole: 99.8% and 93.75% of the speed of light. These speeds are limited by photons emitted from the accretion disk or highly magnetized jets.
The team used advanced computer simulations to see if they could distinguish between these two spin rates using current telescopes, like the Event Horizon Telescope (EHT). Unfortunately, even with the EHT's high resolution of 20 microarcseconds, it couldn't tell the difference. The simulated images looked almost identical.
So what can help? The team suggests looking at another feature: the photon ring. This is a thin but bright circle of light inside the plasma ring surrounding the black hole.
Why It Matters
Understanding black holes' spin speed helps us learn more about these mysterious objects and their impact on our galaxy.
Key Facts
- Black holes can spin at speeds up to 99.8% or 93.75% of the speed of light.
- The Event Horizon Telescope (EHT) has a resolution of 20 microarcseconds.
- Current telescopes can't distinguish between these two spin rates.
- A new tool might help measure black hole spin speeds in the next few years.
- The photon ring is a feature that could help scientists determine spin speed.
Key Terms
- Accretion disk
- A disk of material surrounding a black hole, where matter falls towards it.
Implications
Understanding black holes' spin speed helps us learn more about these mysterious objects and their impact on our galaxy.
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