Re-examination of the Hubble Constant from the Sunyaev-Zel'dovich Effect: Implication for Cosmological Parameters

Abstract

We performed a systematic and comprehensive estimate of the Hubble constant $H_0$ via the Sunyaev-Zel'dovich temperature decrement and the X-ray measurements for clusters up to the redshift $z=0.541$, with particular attention to its dependence on the density parameter ${\Omega }_0$, and the cosmological constant ${\lambda }_0$. The resulting values of $H_0$ are largely consistent with that derived from the Cepheid distance for nearby galaxies. We discuss how the angular diameter distance $d_A$ vs. $z$ diagram from the accurate SZ measurements of high-$z$ clusters can distinguish the values of ${\Omega }_0$ and ${\lambda }_0$.

11 pages. 3 postscript figures included. Publications of the Astronomical Society of Japan (Letters), 1996, vol.48, No.6, in press

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