The Sunyaev-Zeldovich effect in Clusters of Galaxies and the Hubble Constant

Details The Sunyaev-Zeldovich effect in Clusters of Galaxies and the Hubble Constant The Sunyaev-Zeldovich effect in Clusters of Galaxies and the Hubble Constant

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35..217f&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

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Galaxies: Clusters, Cosmology, Large Scale Structure Of The Universe

Scientific paper

The large scale expansion rate of the Universe is given by the value of the Hubble constant. Several methods have been used to determine the Hubble constant: CMB anisotropies, supernovae observations, and AGN at high redshift. In this work we use the Grainge method to estimate the Hubble constant by using the Sunyaev-Zeldovich effect with data from the VSA interferometer (Observatorio El Teide) and the X-Ray data from ROSAT. The derived h = 0.78 is consistent with the reported value obtained with a different set of clusters of galaxies, and it is slightly higher than the h = 0.71 derived with other methods. We discuss the possible discrepancies in terms of the isothermal and spherical cluster hypothesis, and the the Sunyaev-Zeldovich kinetic effect.

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