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Mahesh

13/08/22 00:05 AM IST

Astronomers find extremely aged remnant of galaxies that influence universe’s evolution

In News 
  • A team of Indian astronomers have discovered extremely aged remnant fossil ‘lobes’ of a radio galaxy that had become active about 260 million years ago.
Major Findings 
  • The scientists claimed it was the oldest fossil remnant of a radio galaxy found till date. They added that such fossils contained information of how radio galaxies influenced the course of evolution of our universe.
  • 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 their active galactic nucleus.
  • Each massive galaxy of stars contained a supermassive black hole in its core, which produces jets of charged particles in two opposite directions, once it is active. This relativistic plasma blows huge volumes into the surrounding space, called ‘lobes’, having emerged from the tip of the jet.
  • Such radio fossils can still be detected with large radio telescopes like the Giant Metrewave Radio Telescope (GMRT), from distances of billions of light years.
  • Significance: Studying such relics or fossil lobes reveal how much energy was pumped into these fossil lobes. The study of such radio galaxies and their giant fossil lobes help us find the evolutionary history of the universe.
Source- Down To Earth 

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