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Scientists using data from India's first dedicated astronomy satellite, AstroSat, and NASA's Chandra X-ray observatory have discovered that a black hole in the star system binaries 4U 1630-47 turned near the maximum possible.
Relatively smaller black holes are exotic final states consisting of massive star nuclei, said astronomers led by the Tata Institute of Fundamental Research (TIFR) in Mumbai. The severity of such a nucleus that collapses is such that its entire mass is reduced to a point, according to research whose publication was approved by The Astrophysical Journal. This point, however, can not be seen directly because nothing, not even light, can escape from an area that surrounds it, which justifies the name of the city. object. Surprisingly, astronomical black holes are the simplest objects known in the universe because they can only be fully characterized by two properties, mass and speed of rotation.
Therefore, the researchers stated that the measurements of these two properties are particularly important for exploring some extreme aspects of the universe and the fundamental physics associated with them. "The scientific measurement of the rotation speed of the black hole, an extremely exotic but simplest object in the universe, is approaching the maximum possible value," said PTI Sudip Bhattacharyya, associate professor at TIFR.
"It's usually very important to probe some extreme aspects of the universe, as well as fundamental physics (for example, the theory of gravitation) associated with it," said Bhattacharyya, the main researcher of the X-ray telescope AstroSat (SXT).
Such measurements, in particular the speed of rotation, are very difficult to carry out and can only be carried out by high quality radiographic observations in the good state of the binary star system, in which the black hole engulfs the matter of sound. Star companion, "said Mayukh Pahari, who started this job at TIFR, before joining the University of Southampton in the UK. "The SXT and the Large Area X-Ray Proportional Counter (LAXPC) aboard the first dedicated AstroSat Indian astronomy satellite have played a key role in measuring the speed of rotation of the black hole, which is consistent with the results of our contemporary Chandra satellite data, "Bhattacharyya added. .
"From this first AstroSat-Chandra joint study of a black hole, which could lead to such cooperation, we found that the 4U 1630-47 black hole was spinning very fast, with a rate not much lower than the maximum rate possible, which makes it even more exotic, "added Professor AR Rao of TIFR. AstroSat was launched in 2015 by the Indian Space Research Organization (ISRO).
This is India's first dedicated astronomy satellite and the SXT aboard AstroSat is the first Indian X-ray telescope. "In fact, apart from Japan, I think India is the first Asian country to build an X-ray telescope (for example, China could not build such a telescope until now), "said Bhattacharyya. He pointed out that "this first cooperation between India and the United States using AstroSat and Chandra satellites as part of studies on black holes should pave the way for future collaborations of this type".
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