Clusters of galaxies: a fundamental pillar of cosmology Castillo-Morales, A. Schindler, S. Galaxies Clusters X-ray CHANDRA Vulcano Workshop 2002: "Frontier objects in astrophysics and particle physics", in Vulcano (Italy) 20-25 may 2002. Clusters of galaxies are used in a variety of ways to do cosmology. Some of them are presented here. Their X-ray emitting gas allows us to determine the baryon fraction, dark matter distribution and the matter density Ωm of the universe. Another interesting component is relativistic particles whose radio emission provide the measure of the magnetic fields (≈μG) in the intra-cluster medium (ICM). The observation of distant clusters of galaxies is also important for cosmology. In particular the new X-ray satellites CHANDRA and XMM yield exciting new results for galaxy cluster physics and cosmology. 2013-11-06T12:13:00Z 2013-11-06T12:13:00Z 2003 conference output Castillo-Morales, A.; Schindler, S. Clusters of galaxies: a fundamental pillar of cosmology. In: Vulcano Workshop 2002 "Frontier objects in astrophysics and particle physics". [http://hdl.handle.net/10481/29039] http://hdl.handle.net/10481/29039 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License