The distances to five Type II supernovae using the expanding photosphere method, and the value of H[SUB]0[/SUB]

Abstract

We have used observations gathered at CTIO to measure distances by the expanding photosphere method (~f M) to. five Type II supernovae. These_ supernovae lie at re~shifts from cz = 1100 km s -1 to cz = 5500 km s , and mcrease to 1~ the_ number of di~tances meas~red usmg EPM. We compare distances derived to 11 Type II superno_vae wi!h distances to their host galaxies measured using the Tully-Fisher method. We find that the Tul_ly-Fisher distances ~ver~ge 11 % 7%_ smaller. The comparison shows no significant evidence of any large distance-dependent bias m the Tully-Fisher distances. We employ the sample of EPM distances from 4.5 MJ:>c to 180 Mpc to derive a value for the Hubble constant. We find H = 73 + 6(statistical) 7(systematlc) km s-1 Mpc-1 .