The Distance of Five Type II Supernovae Using the Expanding Photosphere Method and the Value of H 0

Abstract

We have used observations gathered at CTIO to measure distances by the expanding photosphere method (EPM) to five Type II supernovae. These supernovae lie at redshifts from cz = 1100 km s^-1^ to cz = 5500 km s^- 1^, and increase to 18 the number of distances measured Using EPM. We compare distances derived to 11 Type II supernovae with distances to their host galaxies measured Using the Tully-Fisher method. We find that the Tully-Fisher distances average 11% +/- 17% smaller. The comparison shows no significant evidence of any large distance-dependent bias in the Tully-Fisher distances. We employ the sample of EPM distances from 4.5 Mpc to 180 Mpc to derive a value for the Hubble constant. We find H_0_ = 73 +/- 6(statistical) +/-7(systematic)km s^-1^ Mpc^-1^. Show more