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25 April 2024

» arxiv » astro-ph/9407098

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The Distances to Five Type~II Supernovae Using the Expanding Photosphere Method and the Value of $H_0$
Brian P. Schmidt Robert P. Kirshner ; Ronald G. Eastman ; Mark M. Phillips ; Nicholas B. Suntzeff ; Mario Hamuy ; Jose Maza ; Roberto Aviles ;
Date:	29 Jul 1994
Subject:	astro-ph
Abstract:	We have used observations gathered at CTIO to measure distances by the Expanding Photosphere Method (EPM) to 5 Type II supernovae. These supernovae lie at redshifts from cz = 1100 km/s to z = 5500 km/s, 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%+-7% 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/Mpc.
Source:	arXiv, astro-ph/9407098
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