India's AstroSat telescope has found a galaxy 9.3 billion light-years distant - Insiderfolks

A statement from the Pune-based Inter-University Center for Astronomy and Astrophysics announced that a global team headed by IUCAA scientists has made a significant breakthrough.

India’s AstroSat telescope has found a galaxy 9.3 billion light-years distant – Insiderfolks, – AstroSat, India’s first multi-wavelength satellite, has observed extreme ultraviolet ( UV) light from a galaxy that is 9.3 billion light-years away from Earth, said the Inter-University Centre for Astronomy and Astrophysics (IUCAA).

A statement from the Pune-based Inter-University Center for Astronomy and Astrophysics announced that a global team headed by IUCAA scientists has made a significant breakthrough.

India's AstroSat telescope has found a galaxy 9.3 billion light-years distant  - Insiderfolks
India’s AstroSat telescope has found a galaxy 9.3 billion light-years distant – Insiderfolks

“India’s first multi-wavelength spacecraft, which has five separate tandem X-ray and ultraviolet telescopes, AstroSat, observed intense UV light from a galaxy called AUDFs01, 9.3 billion light-years away from Earth,” he said.

The observation was made by an international team of astronomers headed by Dr. Kanak Saha, IUCAA Associate Professor of Astronomy, and released by ‘Nature Astronomy’ on 24 August, according to the report.

The team consisted of scientists from India, France , Switzerland, the USA , Japan and the Netherlands.

Saha and his colleagues watched by AstroSat the galaxy situated in the Hubble Extreme Deep sector.

These findings lasted more than 28 hours in October 2016, according to the report.

But it has taken about two years since then to closely study the data and establish if the emission is directly from the galaxies.

As UV radiation is absorbed by the Earth’s atmosphere, it must be detected from space, he added.

Previously, NASA’s Hubble Space Telescope (HST), slightly larger than UVIT (UV imaging telescope), did not detect any UV emission (with energy greater than 13.6 eV) from this galaxy because it is too small, it said.

AstroSat / UVIT was able to accomplish this remarkable feat because the background noise in the UVIT detector is much smaller than the HST noise, “Saha said.

Saha said that they knew it would be an uphill challenge to persuade the international community that UVIT reported ultra-UV emissions from this galaxy when the HST was not more efficient.

Dr. Somak Raychaudhury, Director of IUCAA, said, “This is a very important hint as to how the dark ages of the world started, when there was light in the cosmos.”

“We need to know where it began, but it was very difficult to locate the earliest sources of light. I am very proud that my colleagues have made such an significant discovery.”

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