| Abstract: | Multiaperture photometry in V (5500Å), r (6738Å) and IV (10500Å) of 52 spirals in nearby clusters Virgo, Fornax and Grus and farther clusters Cancer, Zw 74-23 and Peg I in the redshift range up to 6000 Km s−1 was combined with HI width to derive three independant distances for each galaxy in these clusters.The plot between the mean distance of each cluster and its redshift, indicates the Hubble ratios of distant clusters Cancer, Zw 74-23 and Peg I are about 77 Km s−1 Mpc−1. Further, the Hubble ratios of distant clusters vary only from 76.3 to 78.9 Km s−1 Mpc−1 while those of nearby clusters Virgo, Fornax and Grus vary through a large range of 58.5 to 83.5 Km s−1 Mpc−1. We interpret these data by postulating a systematic motion toward Virgo for the Local Group.The best value for the global Hubble constant from farther and nearby clusters is derived as 74.3± 4 Km s−1 Mpc−1 and an average value of 289±60 Km s−1 for the infall velocity of the Local Group toward Virgo is also derived. |
