Abstract
There is now a diverse body of evidence that shows the presence of about 1012 M⊙ of cold gas within the central regions of nearby clusters of galaxies. This gas is seen through X-ray observations of clusters by its absorption of the low-energy part of the spectrum. In this contribution I will briefly review the observations that show the strongest evidence for X-ray absorption and indicate what the main uncertainties are in the parameters derived from the observations. I shall also indicate what the likely physical state of the absorbing gas is and finally point out that searches for such large amounts of cold gas in other wavebands have so far not been successful.
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Johnstone, R.M. (1996). X-Ray Observations of Cold Gas in Clusters. In: Bremer, M.N., van der Werf, P.P., Röttgering, H.J.A., Carilli, C.L. (eds) Cold Gas at High Redshift. Astrophysics and Space Science Library, vol 206. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1726-2_21
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DOI: https://doi.org/10.1007/978-94-009-1726-2_21
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