What is a typical mass density for inter-galactic gas in a cluster?

[timjdoom]

TL;DR

As far as I'm aware, galaxy clusters typically have some level of hot gas permeating the entire cluster, which the galaxies within these cluster orbit each other within. What is the typical mass density of that gas?

I assume we can work it out from X-ray emission detections, such as shown with the famous bullet cluster images.

 

[Tom.G]

About 1 atom per cubic meter.

from paragraph two of:
https://pweb.cfa.harvard.edu/research/topic/intergalactic-medium

Which was the first one found with:
https://www.google.com/search?&q=the+density+of+intergalactic+gas

Cheers,
Tom

 

[timjdoom]

OMG, thank you. I tried searching for "mass density of galaxy cluster gas" and variations but never intergalactic gas. The results I found focused on electron density and I struggled to understand the papers e.g. https://academic.oup.com/mnras/article/457/1/281/989241

Clearly I need google my exact question before posting it. Thank you again!