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The study on the effect of black hole spin on quasi-periodic oscillations was led by scientists of which institute?

  1. A.Indian Institute of Astrophysics, Bengaluru
  2. B.Aryabhatta Research Institute of Observational Sciences (ARIES)
  3. C.Physical Research Laboratory, Ahmedabad
  4. D.Inter-University Centre for Astronomy and Astrophysics, Pune

Correct answer

B. Aryabhatta Research Institute of Observational Sciences (ARIES)

Explanation

The correct answer is the Aryabhatta Research Institute of Observational Sciences (ARIES), an autonomous institute of the Department of Science and Technology. Its Numerical and Theoretical Astrophysics Group built the computer simulation of viscous accretion flows used in the work, which was led by Mr Sanit Debnath and Dr Indranil Chattopadhyay, with scientists from the Nicolaus Copernicus Astronomical Center in Poland and MJP Rohilkhand University, Bareilly. The other options name well-known Indian astronomy institutions, but none of them led this study: the Indian Institute of Astrophysics, the Physical Research Laboratory and the Inter-University Centre for Astronomy and Astrophysics had no part in the research described. The results were published in the Journal of High Energy Astrophysics and explain how the spin of a black hole shapes the frequency of quasi-periodic oscillations in its accretion flow.

Read the full article: ARIES Study Explains High-Frequency QPOs Near Spinning Black Holes

Practice Questions

Q1.Science & TechnologyEasy

In the context of black hole research, QPO stands for:

  1. A.Quantum Photon Oscillation
  2. B.Quasi-Periodic Oscillation
  3. C.Quadrupole Phase Orbit
  4. D.Quasar Polar Outflow
Show answer
Correct answer: B. Quasi-Periodic Oscillation

Matter pulled towards a black hole forms an accretion flow that falls inward at high speed and emits non-thermal radiation, and the brightness of that radiation shows nearly regular variations known as quasi-periodic oscillations.

Q2.Science & TechnologyHard

According to the ARIES study, what happens to the shock in the accretion disc when a black hole spins rapidly?

  1. A.It is pushed farther from the black hole, giving only low-frequency QPOs
  2. B.It is pulled closer to the black hole, producing QPOs over a wider range of frequencies
  3. C.It disappears completely and no QPOs are produced
  4. D.It becomes permanently stable and stops oscillating
Show answer
Correct answer: B. It is pulled closer to the black hole, producing QPOs over a wider range of frequencies

The simulations showed that as spin increases, the oscillating shock moves inward and its oscillations grow more pronounced, so the predicted frequencies can exceed 100 Hz for a black hole of about ten solar masses, which matches the fast variations observed in black hole X-ray binary systems.

Q3.Science & TechnologyMedium

Which of the following was NOT named as a research area of the new C-DOT Centre of Excellence?

  1. A.Very large-scale MIMO systems
  2. B.Post-quantum communication
  3. C.Deep-sea mining equipment
  4. D.AI-native communication networks
Show answer
Correct answer: C. Deep-sea mining equipment

The Centre of Excellence at IIT (BHU), Varanasi has been given a brief in communication technology: wireless communications, quantum technologies, cybersecurity and communication systems driven by artificial intelligence, with advanced research in 5G Advanced and 6G technologies, very large-scale Multiple-Input Multiple-Output systems, sensing merged with communication, AI-native networks and devices…

Q4.Science & TechnologyMedium

C-DOT, which signed the agreement for the new Centre of Excellence, works under which ministry?

  1. A.Ministry of Electronics and Information Technology
  2. B.Ministry of Communications
  3. C.Ministry of Education
  4. D.Ministry of Science and Technology
Show answer
Correct answer: B. Ministry of Communications

The Centre for Development of Telematics, or C-DOT, is the research and development centre of the Department of Telecommunications, which is a department of the Ministry of Communications, and it is in that capacity that it signed the agreement for a Centre of Excellence at IIT (BHU), Varanasi.