Astronomers have discovered a black hole 12 times larger than the Sun, hidden 1,550 light years from Earth.
Black holes are very difficult to detect against the black background of the universe.
Black holes are very difficult to detect against the black background of the universe. (Photo: Depositphotos)
To find out how many black holes are hidden in the universe, a team of astronomers examined data from nearly 200,000 binary star systems identified by the Gaia mission. In this issue, they studied the signature of a star orbiting a giant invisible object. As an object so dark that light cannot escape, black holes are very difficult to detect against the inky black backdrop of the universe. They are only known through the flashes of light emitted when they absorb dust and gases, swallow stars, or collide with each other.
According to lead researcher Dr Sukanya Chakrabarti, the most promising candidates were studied in more detail by measuring the star’s light spectrum, using a range of instruments including the Keck Observatory in Hawaii and the Giant Magellan Telescope in Chile. If there is a black hole there, the team can detect it through the impact of the black hole’s gravity on the light spectrum of the orbiting star. Using this method, they paid particular attention to a visible star with a mass less than that of the Sun and orbiting an object 12 times larger than the Sun. The star completes one orbit every 185 days.
“The gravitational force of a black hole on a visible star can be determined from spectroscopic results”Chakrabarti said. “By analyzing the speed of the star, we can infer the magnitude of the companion black hole and its orbital time.”
The research team calculated that the black hole is 1,550 light years from Earth. Currently, an object in the V Puppis star system is only 960 light years from Earth but has not yet been confirmed to be a black hole. Chakrabarti and his colleagues submitted their research results to the journal Journal of Astrophysics.
Article source: VnExpress
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Recently, astronomers discovered a black hole 12 times larger than the Sun, hiding quietly 1,550 light years from Earth. This black hole is quite difficult to detect…