Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..411i&link_type=abstract
Publications of the Astronomical Society of Japan, v.47, p.411-423.
Astronomy and Astrophysics
Astronomy
51
Cosmology, Galaxies: Clusters Of, Galaxies: Intergalactic Medium, X-Rays: General
Scientific paper
The values of the Hubble constant estimated based on the Sunyaev-Zel'dovich effect seem to be systematically lower than those obtained by optical observations. We have investigated possible sources of biases and uncertainties when using the Sunyaev-Zel'dovich effect, including the peculiar velocity of clusters, finite extension of clusters, non-sphericity and sub-clustering of the cluster gas distribution, and non-isothermality. We examined these problems on the basis of analytical arguments, observational data of X-rays, and numerical simulation results, finding that the non-isothermality can affect an estimate of the Hubble constant. Since the temperature profiles of distant clusters are difficult to reliably observe, this produces a significant uncertainty in the Hubble constant due to the Sunyaev-Zel'dovich effect.
Inagaki Yuichiro
Suginohara Tatsushi
Suto Yasushi
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