Winds and X-Rays from Clusters of Galaxies

It is suggested that the X-ray emission observed in rich clusters of galaxies might be thermal bremsstrahlung of gas in a steady-state outflow from the clusters. The mass input of 10 -10 M0 per year is consistent with that calculated in models of galactic evolution. The energy needed ( ergs ) could be due to nonthermal processes inside galaxies or to frictional heating of the intracluster gas. Measured as energy input per unit mass in stars, it is comparable to that produced by our Galaxy in nonthermal processes. The model is found to be in agreement with observation. If the ratio of grains to gas in the ejected matter is comparable to that observed in the interstellar medium of our Galaxy, then we would also predict a detectable diffuse infrared radiation from the center of clusters of galaxies, as well as reddening 0.01 mag. Subject headings: galaxies, clusters of - intergalactic medium - X-rays