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I assumed it was some sort of giant intergalactic "clouds"/bands? If this is the case how it remains localized enough given the particle velocities over (assuming) billions of years? There has to be some sort of containing field but it can't be its own gravity.

Or is WIMP basically uniformly distributed, high energy component of interstellar medium?

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Note, you've both used WIMP here, but that's another thing (weakly interacting massive particle -- a candidate theory for dark matter). You want the acronym WHIM, for warm hot interstellar medium.

I believe the gravity keeps it from diffusing out too much. The high temperature creates a pressure that keeps it from collapsing into balls. Not an expert though!

Well it was said this is plasma with densities of like 10 particles per m3 so there is hardly any pressure.

We know what kind of gravity it takes to keep particles this hot together: this is how we have stars. But it's hard to see how gravity can keep an object this vast, diffuse and energetic together.

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