Distance to the Coma Cluster and the Value of H0

摘要: The Hubble constant H 0 is one of the most fundamental cosmological parameters. In spite astronomers’ efforts over 60 years, still uncertain by a factor two (H 0=50–100 km s-1Mpc-1) as shown in Fig. 1. A conspicuous feature seen this figure shortness error bars compared with range distribution. This may be ascribed to fact that only random errors were taken into account previous studies no allowance made for probable systematic errors. Figure 1 demonstrates need better estimates art distance estimation.