So is this scary? (Black Hole in binary system)

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Discussion Overview

The discussion revolves around the implications of a black hole in a binary system, specifically focusing on the recent observations of V404 Cygni and its behavior. Participants explore the potential risks associated with black holes, their distance from Earth, and the dynamics of mass transfer between the black hole and its companion star.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants express concern about the proximity of the black hole, with one noting that 8,000 light-years seems close, while another argues it is far away and not a supernova event.
  • There is a suggestion that stellar mass black holes may be common in the galaxy, implying that the threat to Earth is likely minimal.
  • One participant raises questions about the variability in the mass transfer from the companion star to the black hole, proposing that the recent x-ray emissions may not be related to the companion's orbit.
  • Another participant speculates on the possibility of mass accumulation in the black hole's accretion disc leading to bursts of emissions, questioning the mechanisms behind these phenomena.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the implications of the black hole's activity or its proximity, with multiple competing views on the significance of the observations and the potential risks involved.

Contextual Notes

Some assumptions about the nature of black hole emissions and the dynamics of binary systems remain unresolved, particularly regarding the relationship between the companion star's behavior and the black hole's activity.

Astronomy news on Phys.org
Jimster41 said:
the cnn version of the story... is a bit thin o_O
Close to non-existing.
News at space.com

8 kly is far away, and it is not even a supernova.
 
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Scientists suspect stellar mass black holes may be very common in our galaxy. We are still here so the threat is probably minimal.
 
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It would also suggest that V404 Cygni is not siphoning mass from its companion in a steady and even manner. Since the companion orbits the black hole every 6.5 days, this latest burst of x-ray emissions would not seem to be related to its orbit. Could there be some variability in the companion that causes additional mass to be transferred? Or could it merely be an accumulation of mass in the accretion disc of the black hole before the excess mass is ejected from the poles of the black hole as x-rays and gamma-rays?
 

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