March 25, 2023
  • Astronomers from McGill University (Canada) and Indian Institute of Science (MSc), Bengaluru used data from GMRT to detect a radio signal originating from atomic hydrogen in an extremely distant galaxy at redshift z=1.29.
    • Redshift represents signal’s wavelength change depending on the object’s location and movement.
    • A greater value of z indicates a farther object.
  • Atomic hydrogen is the basic fuel required for star formation in a galaxy.
    • When hot ionised gas from surrounding medium of a galaxy falls onto universe, gas cools and forms atomic hydrogen.
    • This then becomes molecular hydrogen and eventually leads to formation of stars.
  • Detection was made possible by gravitational lensing phenomenon.
    • In gravitational lensing, light emitted by source is bent due to presence of another massive body between target galaxy and observer, effectively resulting in magnification of signal.

About GMRT

  • It is an instrument for studying astrophysical phenomena, ranging from nearby Solar system to edge of observable Universe, at low radio frequencies.
  • It is operated by National Centre of Radio Astrophysics (NCRA), which is part of Tata Institute of Fundamental Research.
  • GMRT is located in Junnar near Pune.
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