Abstract
ASCA, Japanese X-ray Sattelite, can obtain the spatial distribution of density and temperature of the intracluster medium at the same time and greatly improve the accuracy for the derivation of the Hubble constant using the thermal Sunyaev-Zel'dovich effect. Table 1 shows the results of ASCA observations of 4 distant clusters of galaxies. The parameters of the density distribution were obtained assuming the β model.
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