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Tuesday, January 26, 2021

Scientists by India’s AstroSat discovers galaxies with intense ultraviolet light

A team of scientists led by Inter-University Centre for Astronomy and Astrophysics (IUCAA) has found the galaxies with intense ultraviolet light. India’s first multi-wavelength satellite AstroSat that consists of five novel X-ray and ultraviolet telescopes operating in tandem has recognised excessive UV light from a galaxy called AUDFs01, 9.3 billion light-years distant from Earth.

The team of international astronomers is directed by Dr Kanak Saha, associate professor of astronomy at IUCAA, and was published on August 24 by Nature Astronomy. Apart from India the team involved astronomers from Switzerland, France, USA, Japan and the Netherlands.

The release said, “India’s 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-years away from Earth.”

The team witnessed through the galaxy AstroSat and is located in the “Hubble Extreme Deep field”. In October 2016, the observations continued for more than 28 hours. It took almost two years to carefully look into the data to determine that the radiation is certainly from the galaxy.

Dr Somak Raychaudhury, director of IUCAA told that they need to know when this started and is been very hard to find from Earth’s atmosphere.

NASA’s Hubble Space Telescope (HST) is a large than the Ultra Violet Imaging Telescope (UVIT) on Astrosat was not able to detect any UV emission from this galaxy earlier.

Dr Saha added that AstroSat/UVIT was capable to accomplish the unique feat as the background noise in the UVIT is much lesser than HST.

“This is a very important clue to how the dark ages of the universe ended and, there was light in the universe,” Dr Somak Raychaudhury said.

The IUCAA’s statement published exposed that the Universe was a hot soup of protons, neutrons, and electrons. As the earth began to cool, the protons and neutrons started blending into ionized atoms of hydrogen. The ionised particles of hydrogen and helium pulled electrons, transforming them into neutral particles which let light to move easily for the first time as this light was no longer disseminating free electrons.

Scientists have been finding sources that re-ionised the universe. The defendants have been the first astronomical purposes, particularly the new small galaxies.

The photons released through re-ionisation sources in the early universe are hindered by the intergalactic medium. Hence, with the prevailing level of information and technology, it is unlikely to witness such transmission from the Earth.

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