Does a black hole bring back the stars it swallowed up? Understand what’s going on!

Originally predicted by Einstein’s theory of general relativity, black holes are the most extreme thing in the known universe. These bodies form when stars reach the end of their life cycle, their outer layers explode, and they are so strong in gravity that nothing (not even light) can escape their surfaces.

It is also interesting because it allows astronomers to observe the laws of physics under the most extreme conditions. Periodically, these gravitational giants radiate stars and other nearby objects, releasing large amounts of light and radiation. Read in the text below what science has noticed about black holes.

Do black holes ‘speech’ stars?

In 2018, astronomers witnessed such an event when observing a black hole in a galaxy located 665 million light years from Earth. Moreover, astronomers have already witnessed such events. Other equipment from Harvard and Smithsonian Center for Astrophysics They noticed some not previously seen when examining the same black hole three years later.

As they explained in a recent study, the black hole was shining brightly because it was ejecting (or burning) the remaining matter from the star at half the speed of light. Their findings could provide new insights into how black holes feed and fade over time.

He was leading the team Yvette Sindis, researcher at CfA, who joined an international team of researchers. The article describing their findings recently appeared in the Revue d’Astrophysique. As they report in their paper, the team observed the eruption while re-examining data for tidal disturbance events (TDEs) that have occurred in recent years.

This happens when stars pass close to black holes and are separated into several lanes, a process known as “spaghettitation” because of the way stars are split into filaments.

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This phenomenon has aroused the interest of scientists

In early 2021, scientists looked again at radio data from the Very Large Array (VLA) in New Mexico. To their great surprise, they noticed that the black hole had been mysteriously resurrected. As Cendes explained in a CfA press release:

“It totally took us by surprise – no one had seen anything like this before. We ask for the director’s estimated time on multiple telescopes, ie when you encounter something so unexpected that you can’t go through the normal telescope proposal cycle to observe it.”

According to Ido Berger, a professor of astronomy at Harvard University and CfA and co-author of the new study, the TDE radio observations proved to be the most impressive. The team concluded that this was caused by the black hole ejecting the remaining material from the star at relativistic velocities (description of the speed of light).

This is the first time astronomers have observed such a phenomenon, and the team doesn’t know why the flow was delayed by several years. TDE is well known to emit light when it occurs, as the star’s spaghetti-like material expands around the black hole and heats up, creating a flash that astronomers can see millions of light years away.

In some cases, the missing material returns to space, which astronomers have likened to black holes as “chaotic eaters.” However, emissions released usually disappear quickly after TDE begins rather than years later.

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