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Rogue black holes

  1. Sep 30, 2007 #1
    What kind of a risk do rogue black holes pose to Earth?
  2. jcsd
  3. Oct 1, 2007 #2


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    almost none, I should think

    You might be interested in this technical article


    Here's a sample exerpt from the conclusions section near the end:

    "With so many small black holes having been ejected
    from their host globular clusters, we speculate that ∼
    100 rogue black holes are swarming about in the Milky
    Way halo with masses from ∼ 100 − 1000M⊙, and with
    velocities mostly on the order of a few hundred km s^−1.
    The number of rogues could be in the thousands if, as has
    been suggested, the current globular cluster population
    is a small fraction of the total number originally created
    (Aguilar et al. 1988)."

    The article has been submitted to the Astrophysical Journal---it is not just a popular science-journalism piece.
    Still too early to know if it will pass peer-review and be accepted for publication. I know two of the authors somewhat by name and reputation and my hunch is that it is journal-quality and will appear in ApJ.

    the impression I get is that the risk from "rogue" BHs (which I think just means BHs given random eccentric motion by the kick of their formation) is negligible----the risk is vanishingly small and can be ignored.
    Last edited: Oct 1, 2007
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