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

Virialized dark matter halos

  1. Feb 2, 2016 #1
    Dear all,

    I am new in the field of galaxy formation, so I am sorry if my questions are a bit simple.
    -what does virialized halo mean? does it mean they obey the virial theorem concerning their kinetic and potential energy?
    \begin{equation} 2<T>=n<V> \end{equation}
    -Why should the halos be like this to merge and make galaxies?
    -do you know any introductory book I could use in this?
  2. jcsd
  3. Feb 2, 2016 #2


    User Avatar
    Science Advisor

    Yes, it means they obey the virial theorem. It's expected that a self-gravitating gas cloud should relax into a state where it follows the virial theorem as it reaches equilibrium. However, it's known that the virial theorem frequently is inaccurate for real systems. For example, if a pair of galaxies have recently collided to form one larger galaxy, the resulting galaxy will not be very close to following the virial theorem for some time. It's a very useful approximation to make the math tractable, but not always accurate.
  4. Feb 3, 2016 #3
    Is there any introductory book or paper that I can read about this?
  5. Feb 3, 2016 #4


    User Avatar
    Gold Member

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook