Astronomers from India discover giant radio galaxies
A team of astronomers from India reported on the discovery of a large number of extremely rare galaxies called “giant radiogalaxies” (GRG), the largest known galaxies in the universe.
The last six decades of radio astronomy research led to the detection of thousands of radio galaxies. However, only about 300 of them can be classified as IBCs. The reasons for its large size and rarity are unknown.
“Our work will help us understand how these galaxies become so large,” said lead researcher Pratik Dabhade, the Inter-University Center for Astronomy and Astrophysics (IUCAA, Pune). “The size of GRG challenged no theoretical explanation to date. And the Dutch Leiden Observatory.
Dabhade worked with Joydeep Bagchi (IUCAA), Mamta Pommier (CNRS Lyon Observatory), Madhuri Gaikwad (NCRA-TIFR Pune Maxn Planck Institute of Bonn), Shishir Sankhyayan (IISER Pune) and Somak Raychaudhury (IUCAA).
“We are investigating if they were born in the galaxy regions of very low density, or have very powerful radio jets, although collimés and sustainable that allow them to extend over great distances,” he said in a statement.
The team carried out a systematic search of the giant radio and found a large sample of IBCs, using a radio survey of nearly 20 years.
In the Monthly Notices magazine of the Royal Astronomical Society, scientists reported on the discovery of 25 of the National Survey GRAS Survey Radio astronomy of the very large arsenal.
These extremely active forms of galaxies harbor a super-solid “core core” that ejects a pair of high-energy jets at almost the speed of light particles, which are terminated by two giant radio lobes.
According to Joydeep Bagchi, “understanding the life cycle of black hole energy activity, the properties of the penetrating material and the influence of the surrounding environment, which acts upon them from the lobes of host galaxies and provides a” work – zone ‘so that radio jets act, are some of the most important problems in this area. ”
The IBCs are accessible only to radio telescopes.
These giants cover about three million light-years, or even more times. This size corresponds to the stack of almost 33 galaxies as milk channels in line.
Since GRG is known to increase to such large sizes, they are considered the last step in the evolution of radio galaxy.
The first GRG was discovered in the 1970s using the Westerbork Radio Telescope Synthesis of the Netherlands in 1974.
Since then, all large radio telescopes and powerful computer simulations have been used in order to unravel its mysterious nature.