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

Falcón, N.; Génova-Santos, R.
Bibliographical reference

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 35, pp. 217-218 (2009) (http://www.astroscu.unam.mx/~rmaa/)

Advertised on:
5
2009
Number of authors
2
IAC number of authors
0
Citations
0
Refereed citations
0
Description
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.