Phase Diagram: Physical Internal Energy vs. COMOVING Gas Density

Now the Gadget particles internal energy is multiplied by \(m/\rho dv\), where \(m\) is the mass of the particle, \(\rho\) is the density of the particle and \(dv\) is the volume of a cell in the Cholla simulation, this way the particles with “larger volume” will have more weight.

Here is the opposite, the internal energy of the particles is divided by \(m/\rho dv\).