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<keyword id="431538" type="PERSON" weightage="20" keywordseo="Astrosat">AstroSat</keyword>, Indias first multi- wavelength satellite, has detected an extreme ultraviolet (UV) light from a galaxy which is 9.3 billion light-years away from Earth, the Inter-University Centre for Astronomy and Astrophysics (IUCAA) said on Monday. A release from the Pune-based Inter-University Centre for Astronomy and Astrophysics said a global team led by IUCAA scientists have achieved the major breakthrough. "Indias first multi-wavelength satellite, which has five unique X-ray and ultraviolet telescopes working in tandem, AstroSat, has detected extreme-UV light from a galaxy, called AUDFs01, 9.3 billion light-yearsaway from Earth," said it said. The discovery was made by an international team of astronomers led by Dr Kanak Saha, associate professor of astronomy at the IUCAA, and published on August 24 by 'Nature Astronomy', the release said. This team comprised scientists from India, France, Switzerland, the USA, Japan and The Netherlands. Saha and his team observed the galaxy, which is located in the <keyword id="9818101" type="UNKNOWN" weightage="20" keywordseo="hubble-extreme-deep-field">Hubble Extreme Deep field</keyword>, through AstroSat. These observations lasted for more than 28 hours in October 2016, the release stated. But it took nearly two years since then to carefully analyse the data to ascertain that the emission is indeed from the galaxy. Since UV radiation is absorbed by Earths atmosphere, it has to be observed from space, it said. Earlier, NASAs Hubble Space Telescope (HST), a significantly larger than UVIT (UV imaging telescope), did not detect any UV emission (with energygreater than 13.6 eV) from this galaxy because it is too faint, it said. AstroSat/UVIT was able to achieve this unique feat because the background noise in the UVITdetector is much less than the ones on HST," said the release quoting Saha. Saha said they knew it would be an uphill task to convince the international community that UVIT has recorded extreme-UV emission from this galaxy when more powerful HST has not. Dr Somak Raychaudhury, Director of IUCAA, said, "This is a very important clue to how the dark ages of the universe ended and there was light in the universe. "We need to know when this started, but it has been very hard to find the earliest sources of light. I am very proud that my colleagues have made such an important discovery." SEE ALSO: <a href="https://www.businessinsider.in/politics/india/news/congress-working-committee-cwc-meeting-updates-decision-on-congress-new-president-sonia-gandhi-or-rahul-gandhi/articleshow/77717675.cms">Sonia Gandhi offers to quit, Manmohan Singh holds her back and Rahul Gandhi questions party leaders — the CWC meeting reveals the cracks in Congress</a> <a href="https://www.businessinsider.in/science/environment/news/cognizant-says-it-will-spend-2-7-crore-to-restore-sebakkam-lake-and-help-natural-marshland-pallikaranai-wetland/articleshow/77716094.cms">Cognizant says it will spend ₹2.7 crore to restore one of India's last natural marshlands in Chennai</a> <a href="https://www.businessinsider.in/finance/banks/news/axis-bank-trims-its-investment-in-max-life-insurance-from-30-to-18/articleshow/77721249.cms">Axis Bank trims its investment in Max Life Insurance from 30% to 18%</a>

India's first multi-wavelength satellite detects galaxy 9.3 billion light years away

<keyword id="1595677" type="General" weightage="20" keywordseo="indian-researchers" source="Orion">Indian researchers</keyword> have discovered three supermassive black holes from <keyword id="1666884" type="General" weightage="20" keywordseo="three-galaxies" source="Orion">three galaxies</keyword> merging together to form a triple active galactic nucleus (AGN), that has a much-higher-than-normal luminosity. The rare occurrence in the nearby universe indicates that small merging groups are ideal laboratories to detect multiple accreting supermassive black holes and increases the possibility of detecting such occurrences. Supermassive black holes are difficult to detect because they do not emit any light, but can reveal their presence by interacting with their surroundings. When the dust and gas from the surroundings fall onto a supermassive <keyword id="6409890" type="General" weightage="20" keywordseo="black-hole" source="Orion">black hole</keyword>, some of the mass is swallowed by the black hole, but some of it is converted into energy and emitted as electromagnetic radiation that makes the black hole appear very luminous. A team of researchers from the <keyword id="385273" type="General" weightage="20" keywordseo="indian-institute-of-astrophysics" source="Orion">Indian Institute of Astrophysics</keyword> consisting of Jyoti Yadav, Mousumi Das, and Sudhanshu Barway along with Francoise Combes of College de France, Chaire Galaxies et Cosmologie, Paris, while studying a known interacting galaxy pair, NGC7733, and NGC7734, detected unusual emissions from the centre of NGC7734 and a large, bright clump along the northern arm of NGC7733. "Their investigations showed that the clump is moving with a different velocity compared to the galaxy NGC7733 itself. The scientists meant that this clump was not a part of NGC7733; rather, it was a small separate galaxy behind the arm. They named this galaxy NGC7733N," a release from the Ministry of Science and Technology said on Friday. The study, published as a letter in a journal Astronomy and Astrophysics, used data from the Ultraviolet Imaging Telescope (UVIT) onboard the first Indian space observatory ASTROSAT, the European integral field optical telescope called MUSE mounted on the Very Large Telescope (VLT) in Chile and infrared images from the optical telescope (IRSF) in South Africa. The UV and H-alpha images also supported the presence of the third galaxy by revealing star formation along with the tidal tails, which could have formed from the merger of NGC7733N with the larger galaxy. Each of the galaxies hosts an active supermassive black hole in their nucleus and hence form a very rare triple AGN system. According to the researchers, a major factor impacting galaxy evolution is galaxy interactions, which happen when galaxies move close by each other and exert tremendous gravitational forces on each other. During such galaxy interactions, the respective supermassive black holes can get near each other. The dual black holes start consuming gas from their surroundings and become dual AGN. The IIA team explains that if two galaxies collide, their black hole will also come closer by transferring the kinetic energy to the surrounding gas. The distance between the blackholes decreases with time until the separation is around a parsec (3.26 light-years). "The two black holes are then unable to lose any further kinetic energy in order to get even closer and merge. This is known as the final parsec problem," the researchers elaborated. "The presence of a third black hole can solve the problem. The dual merging blackholes can transfer their energy to the third blackhole and merge with each other," they added. "Many AGN pairs have been detected in the past, but triple AGN are extremely rare, and only a handful has been detected before using X-ray observations," the release noted. "However, the IIA team expects such triple AGN systems to be more common in small merging groups of galaxies. Although this study focuses only on one system, results suggest that small merging groups are ideal laboratories to detect multiple supermassive black holes," it added. SEE ALSO <a href="https://www.businessinsider.in/science/health/news/mukesh-ambanis-reliance-life-sciences-gets-approval-to-conduct-trials-for-its-covid-19-vaccine/articleshow/85677741.cms">Mukesh Ambani-owned Reliance Life Sciences' COVID-19 vaccine — here's all we know so far</a> <a href="https://www.businessinsider.in/business/auto/news/tata-motors-is-the-casualty-of-jlr-struggling-due-to-the-global-chip-shortage-and-a-lacklustre-ev-vision/articleshow/85652897.cms">Tata Motors is paying the price because Jaguar Land Rover has been slow in the EV race</a>

Researchers at the Indian Institute of Astrophysics discover three supermassive black holes merging together

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India's first multi-wavelength satellite detects galaxy 9.3 billion light years away

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Researchers at the Indian Institute of Astrophysics discover three supermassive black holes merging together

IANS

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