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Halo around a blackhole

  1. Jan 4, 2010 #1
    Shouldn't there be halo of EM waves around all the blackholes?

    When a star falls into a blackhole, there has to be some radiation perpendicular to the blackhole, which is at some point at the right distance to form a halo.

    Is the amount of bending of light due to gravity same for all EM waves, regardless of frequency? If not, there should be multiple halo for each of the EM waves.

    I understand we wouldn't be able to observe a perfect halo either.
    Last edited: Jan 4, 2010
  2. jcsd
  3. Jan 4, 2010 #2

    George Jones

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    The problem is the very small size of the halo. For example, the halo around the black hole at the centre of our galaxy should appear to us as 55 microarcseconds across. There is an ongoing effort to use radio telescopes to image this black hole, and there should be an image seen within the next decade. The image has the potential to give us a lot of information. Very exciting!
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