Accretion disk around galaxy NGC 4261

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SUMMARY

The discussion centers on the characteristics of the accretion disk surrounding galaxy NGC 4261, highlighting its structure which includes a cold outer region, a dark dusty ring, and an ultra-hot inner accretion disk near the black hole. Participants confirm that the dust in the outer regions does not emit bright radiation in UV or X-rays due to its temperature and the wavelengths of light it receives. The conversation emphasizes the relationship between temperature and radiation frequency, clarifying why the dust appears dim in visible wavelengths.

PREREQUISITES
  • Understanding of accretion disk dynamics
  • Familiarity with black hole physics
  • Knowledge of electromagnetic radiation and its wavelengths
  • Experience with astronomical imaging techniques
NEXT STEPS
  • Research the properties of accretion disks in different galaxies
  • Study the relationship between temperature and radiation in astrophysics
  • Explore the methods used in X-ray astronomy
  • Learn about the observational techniques for detecting dust in space
USEFUL FOR

Astronomers, astrophysics students, and anyone interested in the study of black holes and accretion disks will benefit from this discussion.

JeffOCA
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Hello,

When you look at the accretion disk around NGC 4261 (see here), you can read that the dark, dusty disk represents a cold outer region which extends inwards to an ultra-hot accretion disk with a few hundred million miles from the suspected black hole.
So, from the outside, you have successively a bright ring, then a dark dusty ring and "an ultra-hot accretion disk" very close to the center black hole itself.

My question : due to the ultra-hot temperature in the accretion disk, the dark material (dust) is extremely heated and, so, should radiate in a very bright way (UV and/or X-rays). Why not ?

Regards
JF
 
Astronomy news on Phys.org
Ok, the picture link I posted is taken at visible wavelengths that why dust material is not bright. Am I right ?

Regards
JF
 
Yes. Dust tends to radiate at the frequency of light it receives.
 

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