[ml/nj]

It's English and portrays waves through a fluid cross section very well.

Well, now that I think about it we did use "ripple tanks" in my high school physics class (PSSC - it was pretty good) to study waves.

The entire assembly appears to have a 2.5Bly radius.

And how do you know this?

ripples/radius

What kind of a unit is this? Radius of what?

Since there are only ~5.5 ripples/radius, the ejecta, or speed of sound in the gas, is 0.05c.

I don't understand. Does the number 5.5 come from the number of wavelengths extending from the generating object? I still don't understand why these peaks(?) don't extend out indefinitely from the center. How do you infer a wave velocity from any of this?

ML/NJ

[spunkets]

Re: The entire assembly appears to have a 2.5Bly radius.

"And how do you know this?"

The NASA guys said so.

"Radius of what?"

That Persius cluster. The gas cloud is embedded in the galaxies. That's the same as saying the galaxies are embedded in the gas cloud. Both are the Persius cluster which has the radius of 2.5Bly.

"I still don't understand why these peaks(?) don't extend out indefinitely from the center."

There's nothing but intergalatic space outside the Persius cluster. That means there's nothing to propagate a longitudinal shock/sound wave through.

"Does the number 5.5 come from the number of wavelengths extending from the generating object?

Yes.

"How do you infer a wave velocity from any of this?"

If the jet v was c, there would be 120 ripples. There is only ~5.5, so... 5.5/120=0.05c.