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EXPLAINED : NUMBER OF GIANT RADIO GALAXIES

EXPLAINED : NUMBER OF GIANT RADIO GALAXIES

Context

Indian Researchers working on giant radio galaxies (GRG) at Inter-University Centre for Astronomy and Astrophysics (IUCAA) Pune, India and Leiden University, Netherlands, have found nearly 400 new GRGs.

Significance of Giant radio galaxies (GRG)

  • It gives important clues about physics and phenomenology of the black hole accretion process, also about how these massive black holes accrete mass and the efficiency with which they produce these magnificent jets.

Details About Radio Galaxies

  • They are types of active galaxy nuclei which are very luminous at radio wavelengths, with luminosities up to 1039 W between 10 MHz and 100 GHz.
  • The radio emission is due to the synchrotron process.
  • The observed structure in radio emission is determined by the interaction between twin jets and the external medium, modified by the effects of relativistic beaming.
  • The host galaxies are almost exclusively large elliptical galaxies.
  • Radio-loud active galaxies can be detected at large distances, making them valuable tools for observational cosmology.

About Inter-University Centre for Astronomy and Astrophysics

  • It is an autonomous institution set up by the University Grants Commission.
  • It aims to promote nucleation and growth of active groups in astronomy and astrophysics in Indian universities.

About Galaxy

  • It is a huge collection of gas, dust, and billions of stars and their solar systems.
  • It is held together by gravity.

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