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Accretion disk around galaxy NGC 4261

  1. May 4, 2012 #1
    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
     
  2. jcsd
  3. May 4, 2012 #2

    Chronos

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  4. May 4, 2012 #3
    Ok, the picture link I posted is taken at visible wavelengths that why dust material is not bright. Am I right ?

    Regards
    JF
     
  5. May 5, 2012 #4

    Chronos

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