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HomeEducationIndian, US satellites find black hole that spins near maximum possible rates

Indian, US satellites find black hole that spins near maximum possible rates

AstroSat was launched in 2015 by the Indian Space Research Organisation (ISRO). It is the first dedicated astronomy satellite of India, and the SXT aboard AstroSat is the first Indian X-ray telescope

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Mumbai: Scientists using data from India’s first dedicated astronomy satellite, AstroSat, and NASA’s Chandra X-ray Observatory have found that a black hole in the binary star system 4U 1630-47 spins close to the maximum possible rate.

Relatively smaller black holes are exotic end states of massive stellar cores, said astronomers led by the Tata Institute of Fundamental Research (TIFR) in Mumbai. The gravity of such a collapsing core is so strong that its entire mass is crushed into a point, according to the research accepted for publication in The Astrophysical Journal. This point, however, cannot be directly seen, because nothing, not even light, can escape from a region around it, thus justifying the name of the object.

Surprisingly, astronomical black holes are the simplest known objects in the universe, because they can be fully characterised by only two properties, mass and spin rate. Therefore, measurements of these two properties are uniquely important to some extreme aspects of the universe and the fundamental physics related to them, researchers said.

“The scientific measurement of the spin rate of the black hole, an extremely exotic but the simplest object of the universe, comes out to be close to the maximum possible value,” Sudip Bhattacharyya, Associate Professor at TIFR and the Principal Investigator of the AstroSat Soft X-ray Telescope (SXT), said.

“This is generally very important to some extreme aspects of the universe and the fundamental physics (for example, the theory of gravitation) related to them.”

“Such measurements, especially of the spin rate, are very difficult to make, and can be done only by high-quality X-ray observations in the correct state of the binary stellar system, in which the black hole is gobbling matter from its companion star,” said Mayukh Pahari, who started this work 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 Indian astronomy satellite AstroSat played a key role to measure the black hole spin rate, which was consistent with from our contemporaneous Chandra satellite data,” Bhattacharyya added.

“From this first joint AstroSat-Chandra study of a black hole, that may lead to further such cooperations, we have found that the black hole in 4U 1630-47 spins very rapidly, with a rate not much less than the maximum possible rate, which makes it even more exotic,” added Professor AR Rao of TIFR.

AstroSat was launched in 2015 by the Indian Space Research Organisation (ISRO). It is the first dedicated astronomy satellite of India, and the SXT aboard AstroSat is the first Indian X-ray telescope.

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Europeans maimed natives in their colonies- wiped off populations after populations- employing the most brutal methods but when war came knocking on their door, it suddenly became about the world and humanity and peace and fundamental rights. Nah, that doesn't settle right.

@shabdtweets Makes sense when you consider that the very idea of universal human rights was used to justify colonialism. "Humans everywhere should be/are same> but some humans have not attained the level of civilization that Europeans have> Hence it is our duty to bring them up to our level"

मनरेगा में कांग्रेस सरकार ने घोटाला किया। CAG द्वारा किए गए आॅडिट में घोटाला उजागर हुआ कांग्रेस को इसका जबाव देना चाहिए। घोटाला किया कांग्रेस और दोषारोपण दूसरों पर : वित्तमंत्री @nsitharaman
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व्यवस्था प्रमुख होने के नाते टीम के सम्पूर्ण समर्पण का आश्वासन दिया

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