India’s SARAS radio telescope has helped scientists determine the properties of the earliest radio luminous galaxies formed 200 million years after the Big Bang, a period known as the Cosmic Dawn.
GS III: Science and Technology
Dimensions of the Article:
- About SARAS 3
- What are the Findings?
About SARAS 3
- The SARAS 3 radio telescope was invented and built by the astronomers at Raman Research Institute (RRI).
- It is the first telescope worldwide to reach the required sensitivity.
- SARAS aims to design, build and deploy in India a precision radio telescope to detect extremely faint radio wave signals from the depths of time, from our “Cosmic Dawn” when the first stars and galaxies formed in the early Universe
- Weak radio light waves are collected, focused, amplified, and made available for examination by radio telescopes.
- They aid in the study of astronomical objects like as black holes, galaxies, and stars that emit naturally occurring radio radiation.
- These uniquely constructed telescopes study the light with the longest wavelengths, from 1 millimetre to over 10 meters.
- For reference, a nanometer is only 1/10,000th the thickness of a sheet of paper, while visible light wavelengths are only a few hundred nanometers long. In reality, we typically refer to radio light by its frequency rather than its wavelength.
What are the Findings?
- The new information on the period Cosmic Dawn gave an insight into the properties of the earliest radio loud galaxies that are usually powered by supermassive black holes.
- SARAS 3 had improved the understanding of astrophysics of Cosmic Dawn by telling astronomers that less than 3% of the gaseous matter within early galaxies was converted into stars, and that the earliest galaxies that were bright in radio emission were also strong in X-rays, which heated the cosmic gas in and around the early galaxies.
-Source: Indian Express