- #1
yahastu
- 79
- 7
"Assuming that the system is in dynamical equilibrium – that the magnitude of the total potential energy is equal to twice the kinetic energy – a so-called “dynamical mass” can be derived..."
https://astrobites.org/2012/03/16/what-defines-a-galaxy/
I am trying to understand what is meant by dynamical equilibrium in the above quote. It seems that he is talking about the Virial theorem:
https://en.wikipedia.org/wiki/Virial_theorem
In other words, it seems that "a system in dynamical equilibrium" may be defined as "a system where the virial theorem holds."
However, I am curious under what conditions the virial theorem does or does not hold. I think it is one of those things that only becomes approximately true for very large systems, but I'm wondering if it makes any additional assumptions about the dynamics of that system. Does anyone know?
https://astrobites.org/2012/03/16/what-defines-a-galaxy/
I am trying to understand what is meant by dynamical equilibrium in the above quote. It seems that he is talking about the Virial theorem:
https://en.wikipedia.org/wiki/Virial_theorem
In other words, it seems that "a system in dynamical equilibrium" may be defined as "a system where the virial theorem holds."
However, I am curious under what conditions the virial theorem does or does not hold. I think it is one of those things that only becomes approximately true for very large systems, but I'm wondering if it makes any additional assumptions about the dynamics of that system. Does anyone know?
Last edited: