Context: Through 153 nights, 17 scientists from 9 countries in Europe and Asia including researchers from Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital, an autonomous institution of the Department of Science and Technology (DST), Government of India took 2263 image frames and observed the changes in a very high energy gamma-ray emitting blazar ‘1ES 0806+524’ using seven optical telescopes in Europe and Asia.

More on news: 

  • A blazar is a feeding super-massive black-hole (SMBH) in the heart of a distant galaxy that produces a high-energy jet viewed face-on from Earth. 
  • Blazars are one of the most luminous and energetic objects in the known universe with a jet composed of ionized matter traveling at nearly the speed of light directed very nearly towards an observer.
  • The team studied in great details 1ES 0806+524’ flux, color, and spectral index variations within a day and long timescales of the blazer and explained the mechanism behind the variations. 
  • Blazars are among one of the most favourite astronomical transient objects because they emit radiation in the complete EM spectrum, and their flux and polarization are highly variable.

Black hole: 

  • It is a great amount of matter packed into a very small area.
  • The result is a gravitational field so strong that nothing, not even light, can escape.
  • A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. 
  • They were predicted by Einstein's theory of general relativity.The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.


Image Source: NASA