Indias Astrosat Telescope Discovers a Galaxy 9.3 Billion Light Years Away

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India՚s Astrosat Telescope Discovers a Galaxy 9.3 Billion Light Years Away

  • India՚s multi wavelength orbiting telescope, Astrosat, has detected light from a galaxy, called AUDFs01, in the extreme ultraviolet light.
  • The galaxy is 9.3 billion light years away from Earth.
India՚s Astrosat Telescope


  • The discovery was an international collaboration by astronomers from
    • India
    • Switzerland
    • France
    • USA
    • Japan
    • The Netherlands
  • It was led by Associate Professor of astronomy at the Inter University Centre for Astronomy and Astrophysics (IUCAA) , Pune.
  • This is the first time that star forming galaxies have been observed in this extreme UV environment.
  • The team observed the galaxy within the patch of sky called the Hubble extreme Deep Field (XDF) , which itself sits at the center of the Hubble Ultra Deep Field (HUDF) .
  • The HUDF is a small area in the constellation of Fornax, created using Hubble Space Telescope Data.
  • It contains thousands of galaxies and became the deepest image of the universe ever taken at the time.
  • XDF contains about 5500 galaxies, including those that go back 13.2 billion years in time.
  • It is nearly as old as the universe, which is 13,7 billion years old.
  • The youngest galaxy in XDF came into existence barely 450 million years after the Big Bang.
  • AstroSat looked at a part of XDF for 28 hours in October 2016.
  • The feat can be performed only by space telescopes because the atmosphere absorbs ultraviolet radiation.
  • The researchers analyzed the data for two years to ascertain that the emission was indeed from the AUDFs01.
  • AstroSat/UVIT was able to achieve this feat as the background noise in the UVIT detector is much less than the ones on HST (Hubble Space Telescope) .
  • AstroSat is India՚s multi wavelength space telescope.
  • It has five telescopes seeing through different wavelengths simultaneously-
    • Visible
    • Near UV
    • Far UV
    • Soft X-ray
    • Hard X ray
  • AstroSat also has 38 cm wide Ultraviolet Imaging Telescope (UVIT) .
  • UVIT is capable of imaging in far and near ultraviolet bands over a wide field of view.
  • AstroSat was launched on September 28,2015 by ISRO into near Earth equatorial orbit.
  • It is a multi-institute collaborative project involving
    • IUCAA
    • ISRO
    • TIFR (Mumbai)
    • IIA (Bengaluru)
    • Physical Research Laboratory (Ahmedabad)

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