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Scientists have captured the first radio image of two supermassive black holes orbiting each other. This event occurred inside a quasar named OJ287, located billions of light-years away. The image validates a long-held prediction about these celestial bodies. The black holes were detected through particle jets and glowing gas. This groundbreaking observation confirms the existence of orbiting black hole pairs.
Black holes have been one of the biggest mysteries of the universe. The gravity in them is so intense that even light can not pass through them.
According to Einstein's theory of general relativity, time slows down as one approaches block hole's event horizon. To a distant observer, clocks near the black hole appear to tick ever more slowly.
According to the theory, this relationship between time and gravity impacts how we perceive the black hole. When objects orbit or fall into black holes, their motion and light signals are distorted by both gravity and the time wrap.
These distortions make telescopic observations even more tricky. And this is partly why capturing two black holes locked in orbit has been such a challenge. However, for the first time ever, astronomers have captured a radio image of two supermassive black holes orbiting each other inside a quasar called OJ287, roughly 5 billion light-years away.
The visual evidence now validates a prediction long suspected but never seen directly. OJ287 has been under observation for over a century.
In the 1980s, Finnish astronomer Aimo Sillanpää observed that its brightness surged and dipped on a consistent 12‑year cycle, hinting that two black holes might be interacting. The theory has now been validated with the new new radio image. “The two black holes were there in the image, just where they were expected to be,” said Mauri Valtonen of the University of Turku in a press release.
How were the black holes detected?
Since black holes do not emit light of their own, astronomers detected them via particle jets and glowing gas swirling around them. Valtonen said, “The black holes themselves are perfectly black, but they can be detected by these particle jets or by the glowing gas surrounding the hole.”
The smaller of the two black holes is launching a jet that appears twisted, like water from a rotating garden hose. This comes from the rapid motion around its bigger companion. Researchers expect to see this jet “wag” over time like a cosmic tail as the orbit continues.
How was the image taken
The new image was possible because of a joint effort from powerful radio telescopes on Earth and a special space telescope called RadioAstron. This Russian satellite used to orbit halfway to the Moon, and by working together with Earth-based telescopes, it gave astronomers a view that was about 100,000 times sharper than what regular optical telescopes can see.
It is the clearest picture of two supermassive black holes orbiting each other. Until now, scientists had only found indirect signs of such pairs, such as through gravitational waves, but no one had seen them side by side. This image finally confirms they are real and orbiting just like we thought.
Can it be spotted with regular telescopes?
OJ287 is so bright that even amateur astronomers with personal telescopes can spot it.“Quasar OJ287 is so bright that it can be detected even by amateur astronomers with private telescopes,” said Valtonen, who helped lead the research.
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Source: EconomicTimes
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