The Invisible Universe: Dark Matter and Dark Energy

Volume 720 of the series Lecture Notes in Physics pp 125-156

Cosmological Parameters from Galaxy Clusters: An Introduction

  • Paolo TozziAffiliated withINAF – Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, 34131 Trieste – Italy, INFN – National Institute for Nuclear Physics

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This lecture is an introduction to cosmological tests with clusters of galaxies. Here, I do not intend to provide a complete review of the subject, but rather to describe the basic procedures to set up the fitting machinery to constrain cosmological parameters from clusters, and to show how to handle data with a critical insight. I will focus mainly on the properties of X–ray clusters of galaxies, showing their success as cosmological tools, to end up discussing the complex thermodynamics of the di?use intracluster medium and its impact on the cosmological tests.