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A M-sigma vs. M-M_bulge relationship

  1. Mar 12, 2017 #1
    Why is the M-sigma relationship so tight, but the M-M_bulge relationship much looser?

    Don't the theories that black hole growth and star formation are coupled only explain why M_BH would be correlated with M_bulge? We might expect sigma to follow to an extent due to the stars having roughly Keplerian orbits, but why would it be more strongly correlated?
  2. jcsd
  3. Mar 18, 2017 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
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