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

NASA's new WISE Survey Results (and dark matter)

  1. Aug 30, 2012 #1
    NASA yesterday on the 29th published a survey in which they claimed the detection of many new stellar objects. The press release continues to say this includes super-massive black holes 2/3 of which were previously undiscovered.

    This is a lot more mass than we previously knew existed. What are the effects of this on dark matter?


    EDIT The location of these black holes is unclear. I have (perhaps naively) ignored the new galaxies since dark matter is concentrated in a halo around a galaxy and thus should not be affected, but what is the location of the black holes?
  2. jcsd
  3. Aug 31, 2012 #2


    User Avatar
    Science Advisor

    None. Black holes make up a tiny, tiny fraction of the mass of the visible matter. The typical supermassive black hole is less than a couple percent, sometimes less than a fraction of a percent of its host galaxy.
  4. Sep 2, 2012 #3
    Also as far as I am aware, there is an upper bound limit on the number of baryonic matter in the universe, which is where dark matter comes in.

    So even if we start to discover a lot more matter out there (ie black holes), it still won't effect this upper bound limit, and still won't effect the equations of dark matter.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook