2021-11-12

Astronomers have discovered black holes outside the Milky way for the first time by observing how they affect the motion of nearby stars

By yqqlm yqqlm

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6cdd822cb683e8b - Astronomers have discovered black holes outside the Milky way for the first time by observing how they affect the motion of nearby stars

scientists look for black holes by looking for evidence of their effects on their environment and other nearby objects. This may be the light they emit when they devour matter, or the gravitational wave aroused in the universe when a black hole collides with a massive neutron star. However, most smaller black holes do not produce light or collision, so astronomers need to look for less obvious indicators to prove the existence of black holes in a distant star system

Stefan dreizler of the University of Gottingen in Germany explained in a statement: “when they form a system with a star, they will affect its motion in a subtle but detectable way, so we can find them with complex instruments.”

dreizler is a member of an international team, Using the very large telescope of the European Southern Observatory in Chile, the team found a black hole in the NGC 1850 cluster of the Large Magellanic galaxy, which is located about 160000 light-years away. This is considered to be the first time that we have discovered a black hole outside our Milky Way galaxy by paying attention to the impact of black holes on nearby stars

“similar to Sherlock Holmes tracking criminal gangs from their misdeeds, we are looking at each star in the cluster with a magnifying glass in one hand, trying to find some evidence of the existence of black holes, but we don’t see them directly,” said Sara saracino of John Moores University in Liverpool, who led the study. “The results shown here represent only one of the’wanted’, but when you find one, you can well find many other black holes in different clusters.”

a paper on this discovery will be published in the forthcoming monthly journal of the Royal Astronomical Society

researchers say that the new tool provides a powerful way to identify more black holes and understand how these mysterious celestial bodies form and develop

mark gieles of the University of Barcelona, Spain, co-author of the research report, said: “every exploration we make will be very important for our future understanding of star clusters and black holes in them.” this may include a deeper understanding of how black holes expand by swallowing stars and even merging with other black holes