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

I Milky Way's Globular Clusters

  1. Jan 23, 2017 #1
    My question is directly towards figure 2.15 from Galaxies in the Universe, An Introduction by Sparke and Gallagher.

    Everything in the figure makes sense to me until the authors make the point, "Clusters with a blue horizontal branch (filled dots) are more concentrated to the center than are those with a red horizontal branch (open circles)."

    My understanding is that metal-rich clusters will have a redder horizontal branch and metal-rich clusters are concentrated near the galactic center as shown by the left side. Why then, are the bluer horizontal branches concentrated towards the center?

    For context, these are the two paragraphs which follow the figure though there isn't much detail about this.
  2. jcsd
  3. Feb 12, 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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted