30 Aug 2021 Indian astronomers have discovered a rare merger of three supermassive black holes

Indian astronomers have discovered a rare merger of three supermassive black holes

The Context

1. A team of astrophysicists in India have discovered an unusual merging of three supermassive black holes. 
2. They were looking at the merging of two galaxies in our neighbourhood, NGC7733 and NGC 7734, when they saw anomalous emissions from the centre of the latter, as well as a strange movement of a massive luminous clump with a different velocity than NGC7733. 
3. The scientists termed it NGC7733N after deducing that it was a distinct galaxy.

The Inferences

1. If two galaxies collide, their black holes will also collide, delivering kinetic energy to the surrounding gas, according to the Indian Institute of Astrophysics (IIA) research. 
2. The distance between the blackholes shrinks with time until it is less than a parsec (3.26 light-years). 
3. The two black holes are then unable to lose any more kinetic energy, preventing them from approaching each other and merging. The ultimate parsec difficulty is what it’s called. This problem can be solved by the presence of a third black hole. 
4. The energy of the two merging blackholes can be transferred to the third blackhole, allowing them to unite.

Source: The Hindu
Syllabus: prelims, GS 3 (Science & Technology)

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Yojna IAS Current Affairs Team