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Abstract: Using analytical models and cosmological N-body simulations, we study thefree-free radio emission from ionized gas in clusters and groups of galaxies.The results obtained with the simulations are compared with analyticalpredictions based on the mass function and scaling relations. Earlier worksbased on analytical models have shown that the average free-free signal fromsmall haloes galaxies during and after the reionization time could bedetected with future experiments as a distortion of the CMB spectrum at lowfrequencies $ u <$ 5 GHz. We focus on the period after the reionization timefrom redshift $z=0$ up to $z=7$ and on haloes that are more massive than inprevious works groups and clusters. We show how the average signal fromhaloes with $M > 10^{13} h^{-1} M {\odot}$ is less than 10% the signal from themore abundant and colder smaller mass haloes. However, the individual signalfrom the massive haloes could be detected with future experiments opening thedoor for a new window to study the intracluster medium.



Author: P.P. Ponente, J.M. Diego, R.K. Sheth, C. Burigana, S.R. Knollmann, Y. Ascasibar

Source: https://arxiv.org/



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