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Gamma-ray emitting galaxy
April 15 , 2021
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- The Indian researchers discovered a rare and farthest gamma-ray emitting galaxy.
- This newly found galaxy was named as NLS1 (Narrow-Line Seyfert 1) galaxy.
- These galaxies are classified as AGN or Active Galactic Nuclei.
- Compared to normal galaxies, these active galaxies can emit up to thousands of times of energy.
- The emissions of active galaxies are non-stellar (non-thermal) that are observed in the form of microwave, radio, infrared, optical, X-ray, ultra-violet, and gamma-ray wavebands.
- One of the largest ground-based telescopes in the world Subaru Telescope located in Hawaii in US, was used for this.
- It was formed when the Universe was only about 4.7 billion years old.
- The current age of the Universe is 13.8 billion years.
- The Scientists from the Aryabhatta Research Institute of observational sciencES (ARIES), Nainital have found this.
- It is an autonomous institute of the Department of Science & Technology (DST), Government of India.
Redshift
- Since Edwin Hubble in 1929 announced that the Universe is expanding, it was noted that the galaxies are moving away from us.
- The light, in form of wavelengths, from these receding galaxies is measured as redshift.
- This means farther the galaxies, the redder wavelengths of light and a larger redshift value.
- Such galaxies are classified as redshifted galaxies.
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