Robustness of the Sunyaev-Zel’dovich Effect as a Measure of the Hubble Constant
CAO Li1,2, ZHANG Yuan-Zhong3, ZHU Zong-Hong1,2,3
1Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012
2National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
Robustness of the Sunyaev-Zel’dovich Effect as a Measure of the Hubble Constant
CAO Li1,2;ZHANG Yuan-Zhong3;ZHU Zong-Hong1,2,3
1Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012
2National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012
3Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080
Abstract： After inversing the x-ray surface brightness of the cooling flow cluster Abell 1689 through the isothermal β model, the isothermal double β model and the x-ray surface brightness distribution model derived from the universal dark matter density profile, we calculate the electron distribution and the Sunyaev-Zel'dovich (SZ) effect of the cluster. The resulting temperature decrements, which are inversely proportional to the square root of H0, are very different for the three models, with uncertainty of 15%. Thus, the SZ/x-ray route can not be taken as a precise measurement of H0 until further observations (e.g. from the satellite AXAF) constrain well the amount and distribution of cluster gas.
CAO Li;ZHANG Yuan-Zhong;ZHU Zong-Hong;. Robustness of the Sunyaev-Zel’dovich Effect as a Measure of the Hubble Constant[J]. 中国物理快报, 2001, 18(4): 622-624.
CAO Li, ZHANG Yuan-Zhong, ZHU Zong-Hong,. Robustness of the Sunyaev-Zel’dovich Effect as a Measure of the Hubble Constant. Chin. Phys. Lett., 2001, 18(4): 622-624.
2001, Vol. 18 
