IAS Gyan
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Daily News Analysis

RADIO GALAXIES

1st March, 2023 Science and Technology

Disclaimer: Copyright infringement not intended.

Context

  • A team of astronomers has discovered several ‘elusive dying radio galaxies’ using some of the world’s most powerful radio telescopes, including the Giant Metrewave Radio Telescope (GMRT) located in Khodad, Pune.

Radio Galaxy

  • A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure.
  • These energetic radio lobes are powered by jets from its active galactic nucleus.
  • They have luminosities up to 1039 W at radio wavelengths between 10 MHz and 100 GHz.
  • Radio-loud active galactic nuclei (radio galaxies and radio-loud quasars; hereafter RLAGN) are a subset of the active galaxy population in which accretion onto the central supermassive black hole of a galaxy generates a relativistic jet of charged particles (electrons, positrons, and/or protons) and magnetic field.

Read about GMRT: https://www.iasgyan.in/daily-current-affairs/gmrt

PRACTICE QUESTION

Q) Which of the following statements is/are correct?

a. A radio galaxy is a galaxy with giant regions of radio emission extending well beyond its visible structure.

b. They have luminosities up to 1039 W at radio wavelengths between 10 MHz and 100 GHz.

 I. Only a

II. Only b

III. Both a and b

IV. Neither a nor b

Answer: Option III

 

https://www.hindustantimes.com/cities/pune-news/astronomers-discover-elusive-dying-radio-galaxies-using-deep-radio-surveys-101677444198313.html