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Galactic black holes

  1. Aug 7, 2015 #1
    Hi,
    what is the percentage of Galaxies where we expect a central black hole?
    What type are those Galaxies?
    Thanks!
     
  2. jcsd
  3. Aug 7, 2015 #2

    mfb

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    Wikipedia answers this with the first sentence of the article, including two references:
     
  4. Aug 7, 2015 #3
    This is the answer I expected. Can't say all galaxies since we have only observed a tiny portion of the universe. What if there was a galaxy out there that didn't have a super massive black hole? Time and more research will tell.
     
  5. Aug 7, 2015 #4

    Chronos

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  6. Aug 7, 2015 #5
    Thank you for providing that article, Chronos. I enjoyed the read. Do you believe or have knowledge of the structure of ancient galaxies? I can't imagine there being a black hole, let alone a SMBH at the center of the earliest known galaxies. I'm talking of galaxies a few hundred million years after the universe came into existence.
     
  7. Aug 7, 2015 #6

    Chronos

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    Direct collapse black holes remain a candidte possibility. Generally this scenario permits SMBH to form very rapidly in the early universe and anchor the formation of galaxies. You may find these papers of interest:http://arxiv.org/abs/0709.0545, Did supermassive black holes form by direct collapse?; http://arxiv.org/abs/1304.1369here [Broken] http://arxiv.org/abs/1304.1369, Supermassive Black Hole Formation at High Redshifts via Direct Collapse: Physical Processes in the Early Stage; and http://arxiv.org/abs/1403.5267, The First Billion Years project: birthplaces of direct collapse black hole
     
    Last edited by a moderator: May 7, 2017
  8. Aug 7, 2015 #7
  9. Aug 7, 2015 #8
    Thank you for responding, Chronos, and thank you for providing these documents. I never thought of a black hole directly collapsing. I'll read these and find out for myself!
     
    Last edited by a moderator: May 7, 2017
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