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Rogue black holes?

  1. Sep 9, 2010 #1

    Astronuc

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    Hundreds of "Rogue" Black Holes May Roam Milky Way
    http://news.nationalgeographic.com/news/2008/01/080110-black-holes.html
    Astronomers have long known about rogue black holes? How long? Is this a new revelation about DM and BHs?
     
    Last edited by a moderator: Apr 25, 2017
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  3. Sep 10, 2010 #2

    Chronos

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    'Hundreds' of rogue black holes in our galaxy? So where are they [Fermi thing]? I doubt we are at risk.
     
  4. Sep 10, 2010 #3
    Haha I can see the news article now.

    "There is a black hole careening towards earth."

    Oh my what would we do? lol
     
  5. Sep 10, 2010 #4
    It is not uncommon for a star to implode and become a black hole. It happens all the time. Why not in our galaxy.

    ______________________________________________________________________________________________________
    Society lives by faith, and develops by science.
     
  6. Sep 10, 2010 #5
    i fully agree with ya there, given the timespan that the milky way has been active and the average lifespam of a star of the size needed to become a black hole, the numbers of black holes predicted in our galaxy are enormous, for research now to suggest that we have hundreds of "rogue" black holes roaming around isn't surprising, as for us being in any sort of risk or running into one, well, i wouldnt like to take them odds! the galaxy is a very big place.
     
  7. Sep 11, 2010 #6

    Chronos

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    Hundreds of 'rogue' black holes in our galaxy is not an alarming number - something on the order of less than 1 per hundred million stars.
     
  8. Sep 11, 2010 #7

    Astronuc

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    It occurs to me that the precursors to rogue BH are rogue stars. So what proportion of stars are rogue? Does that vary with location in the galaxy, e.g., halo vs disk/arms vs nucleus (central bulge)?

    Rogue Stars: The Miscreants of Our Galaxy
    http://www.space.com/scienceastronomy/080129-st-rogue-stars.html

    Hubble Catches Heavyweight Runaway Star Speeding from 30 Doradus
    http://hubblesite.org/newscenter/archive/releases/2010/14/full/

    http://news.discovery.com/space/hubble-spies-trailblazing-star-ripped-from-stellar-nursery.html

    Somewhat related
    http://news.discovery.com/space/rogue-stars-non-constant-constants-holes-in-space-our-universe-is-rebelling.html [Broken]
     
    Last edited by a moderator: May 4, 2017
  9. Sep 12, 2010 #8

    Chronos

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    Actually rogue black holes may be more plentiful than ordinary rogue stars due to gravitional recoil. But, stellar collisions of any kind are extremely rare. It is estimated they occur no more than once every 10 million years in this galaxy.
     
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