TNPSC Thervupettagam

Gamma-ray emitting galaxy

April 15 , 2021 1318 days 905 0
  • The Indian researchers discovered a rare and farthest gamma-ray emitting galaxy.
  • This newly found galaxy was named as NLS1 (Narrow-Line Seyfert 1) galaxy.
  • These galaxies are classified as AGN or Active Galactic Nuclei.
  • Compared to normal galaxies, these active galaxies can emit up to thousands of times of energy.
  • The emissions of active galaxies are non-stellar (non-thermal) that are observed in the form of microwave, radio, infrared, optical, X-ray, ultra-violet, and gamma-ray wavebands.
  • One of the largest ground-based telescopes in the world Subaru Telescope located in Hawaii in US, was used for this.
  • It was formed when the Universe was only about 4.7 billion years old.
  • The current age of the Universe is 13.8 billion years.
  • The Scientists from the Aryabhatta Research Institute of observational sciencES (ARIES), Nainital have found this.
  • It is an autonomous institute of the Department of Science & Technology (DST), Government of India.

Redshift

  • Since Edwin Hubble in 1929 announced that the Universe is expanding, it was noted that the galaxies are moving away from us.
  • The light, in form of wavelengths, from these receding galaxies is measured as redshift.
  • This means farther the galaxies, the redder wavelengths of light and a larger redshift value.
  • Such galaxies are classified as redshifted galaxies.

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