Giant Radio Galaxies in Universe

admin September 14, 2020 Daily Current Affairs

RESEARCHERS WORKING on giant radio galaxies (GRG), which are large single structures in the universe, have found its largest sample to date.
Until 2016, only about 300 GRGs were known since their discovery in 1974 and, from our work, we have found nearly 400 new GRGs; the total is about 820.
It is not clearly understood how some objects grow to such large scales and what is the fuel of their respective black holes.
Their properties like total mass of their black holes found to be the same.
Also, only 10 per cent GRGs are found in dense environments indicating that majority avoid dense surroundings.
The universe has billions of galaxies and almost all have supermassive black holes at the centre.
Some of these black holes are active and produce jets travelling almost at the speed of light.
These jets are visible in radio light or at radio wavelength of the electromagnetic spectrum.
Such galaxies, which have active black holes shooting high-speed jets, are called radio galaxies.
The study of GRGs gives us important clues to unveiling the physics and phenomenology of the black hole accretion process or,
- in other words, how these massive black holes accrete mass and the efficiency with which they produce these magnificent jets.