Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Over-population of Black Holes

  1. Sep 9, 2016 #1

    wolram

    User Avatar
    Gold Member

    I find this article hard to believe can there be so many Black Holes in one galaxy, if there are, why are there not many mergers recorded by Ligo.

    https://www.sciencedaily.com/releases/2016/09/160907215155.htm

    Computer simulations of a spherical collection of stars known as 'NGC 6101' reveal that it contains hundreds of black holes, until now thought impossible. Recent observations already found black hole candidates in similar systems, with this research enabling astrophysicists to map black holes in other clusters. These systems could be the cradle of gravitational wave emission, 'ripples' in the fabric of space-time
     
  2. jcsd
  3. Sep 9, 2016 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Hundreds of black holes can still mean one merger per 100 billion years or something like that - unless they form in a binary system, mergers are extremely rare. Those black holes have a few times the mass of sun each, so LIGO won't have such a large detection range for them.
     
  4. Sep 9, 2016 #3

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    Why don't we see the sky alight with stellar collisions? After all, the styar density is much larger than the black hole density?
     
  5. Sep 9, 2016 #4

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Well, which fraction of stellar collisions 100 million light years away do we detect?
     
  6. Sep 9, 2016 #5

    Chronos

    User Avatar
    Science Advisor
    Gold Member

    I'm curious about the apparent lack of consideration for DM in NGC6101. I suspect a massive DM component could also suppress mass segregation. The arxiv version of the subject paper is: http://arxiv.org/abs/1609.01720, A stellar-mass black hole population in the globular cluster NGC 6101?.
    ".
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Over-population of Black Holes
  1. Black holes (Replies: 3)

  2. Black Hole (Replies: 3)

  3. On Black Holes (Replies: 0)

  4. Black holes (Replies: 17)

  5. Black holes colliding (Replies: 3)

Loading...