Nature of radiation emanating from a body v/s frequency

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SUMMARY

The discussion centers on the differences in radiation emitted by dense bodies like black holes compared to regular stars such as the Sun. It is established that black holes do not emit radiation in the conventional sense; instead, they are associated with X-rays generated by matter falling into them, as seen in sources like Cygnus X-1. Regular stars primarily emit radiation in the ultraviolet, visible, and infrared ranges. The complexity of Hawking Radiation is also noted, indicating that its frequency is not straightforward to deduce.

PREREQUISITES
  • Understanding of black hole physics
  • Familiarity with electromagnetic spectrum and radiation types
  • Knowledge of Hawking Radiation theory
  • Basic concepts of X-ray astronomy
NEXT STEPS
  • Research the properties of Hawking Radiation and its implications
  • Study X-ray emissions from black holes, focusing on Cygnus X-1
  • Explore the electromagnetic spectrum, particularly UV, visible, and infrared radiation
  • Investigate the mechanisms of radiation from accretion disks around black holes
USEFUL FOR

Astronomers, astrophysicists, and students interested in black hole research and the nature of cosmic radiation will benefit from this discussion.

petrushkagoogol
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Does the nature of radiation emitted by dense bodies like black holes differ in frequency from radiation emitted by regular stars like our Sun ? I believe that the former radiates more x-rays and high frequencies rather than the latter which radiates mainly uv, visible and infrared ranges. Is this so ?
 
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petrushkagoogol said:
Does the nature of radiation emitted by dense bodies like black holes differ in frequency from radiation emitted by regular stars like our Sun ? I believe that the former radiates more x-rays and high frequencies rather than the latter which radiates mainly uv, visible and infrared ranges. Is this so ?
Black holes do not radiate in the way you seem to think. Deducing the frequency of Hawking Radiation apparently is quite complex.
 
petrushkagoogol said:
Does the nature of radiation emitted by dense bodies like black holes differ in frequency from radiation emitted by regular stars like our Sun ? I believe that the former radiates more x-rays and high frequencies rather than the latter which radiates mainly uv, visible and infrared ranges. Is this so ?

phinds said:
Black holes do not radiate in the way you seem to think.

Phinds is correct
... maybe you were thinking of the X-rays that are radiated by the material falling towards the black hole, prior to it crossing the event horizon
do some googling on Cygnus X-1 for one of the earlier black hole X-ray sources identifiedDave
 

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