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Science & Tech.
Pradeep Kumar

18/03/21 10:00 AM IST

Possible origin of winds from black hole

In news

Scientists have tracked the generation of this wind and how it is driven by the disc of diffused swirling materials around the black hole called an accretion disc

How?
  • As gas and dust fall toward a black hole, they form a disk around it.
  • As material piles up in the disk, it heats up to temperatures in excess of millions of degrees.
  • A fraction of this infalling matter is ejected in the form of winds.
Theoretical concept
  • By blowing dense gas from the galactic nucleus and by halting inward flows from the galactic halo, the winds play a vital role in shaping the evolution of the black hole host galaxy.
  • Hence the mechanism of generation of these winds and what drives them has intrigued scientists for a long as it helps them explore host galaxies.
  • The scientists tried to figure out whether driving of the wind by radiation flux can dominate the radiation drag effect a motion resisting effect which is similar to the resistance offered by air to a moving stone or to a descending parachute.
  • This effect is produced when radiation penetrates a moving medium and is proportional to radiation energy density, various components of radiation pressure, and the velocity components of the wind.
  • The authors showed that luminous discs can produce winds up to speeds which is about ten percent of the speed of light, and also that these winds originated from regions close to the central black hole.
  • Radiation drag plays a key role in reducing the speed of light. For less bright discs, radiation drag quenches the wind completely.
Source: PIB

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