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ULX's and Blackholes

  1. Oct 8, 2014 #1
    Scientists had long thought that black holes were the only sources for ULXs. As black holes consume nearby material, they emit powerful icon1.png X-rays thought to be responsible for the extremely bright ULX objects.

    http://www.space.com/27385-pulsar-discovery-superbright-xray-beacon.html

    A few questions.

    1.How fast is the velocity of the escaping ULX from the black hole?
    2.Wouldn't the ULX have to be traveling faster than the speed of light to escape the black hole?
    3.What is the distance from the black hole that a ULX is able to travel once the ULX escape?
    4.Specifically what type or types of material generate the ULX's?
    5.Are the ULX's able to be gathered or harvested for energy production use?
     
  2. jcsd
  3. Oct 8, 2014 #2

    phinds

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    X rays are part of the electromagnetic spectrum. Why would you think they travel at any speed other than c (in a vacuum) ?

    You keep talking about "ULX" (which is the name of an X-ray emitting object) as thought the term were synonymous with X-ray. That's like saying the sun is exactly the same thing as visible light.

    An "Ultra Luminous" X-ray source just emits a lot of X-rays (and I mean a LOT of X-rays) but this is a quantitative characteristic of the emmissive object, not a characteristic of the X-rays, which are, after all, just X-rays.

    Nothing escapes from a black hole. The X-ray emission "from a black hole" is from the accretion disk / processes outside the Event Horizon
     
  4. Oct 10, 2014 #3
    An "Ultra Luminous" X-ray source just emits a lot of X-rays (and I mean a LOT of X-rays) but this is a quantitative characteristic of the emmissive object, not a characteristic of the X-rays, which are, after all, just X-rays.

    If there are a lot of X-rays being produced from a black hole would the x ray have a momentum value that could be transformed into energy?
     
  5. Oct 10, 2014 #4
    X-rays, or rather all photons, always have a momentum that can be related to the energy of the photon by the equation E=pc. This comes from the more general form of the energy-momentum relation.
     
  6. Oct 10, 2014 #5
    X-rays, or rather all photons, always have a momentum that can be related to the energy of the photon by the equation E=pc. This comes from the more general form of the energy-momentum relation.

    So would this mean that photons having momentum even though they do not have any mass could create a force of resistance against an object?
     
  7. Oct 10, 2014 #6
    Photons always have a momentum p=E/c.
     
  8. Oct 10, 2014 #7

    phinds

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    Dryson, please learn how to use the quote mechanism built into the forum. Your lack of doing so makes your posts slightly confusing.
     
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