paper

Determination of the Hubble Constant Using a Two-Parameter Luminosity Correction for Type Ia Supernovae

arXiv:astro-ph/9904347 · doi:10.1086/307883

Abstract

In this paper, we make a comprehensive determination of the Hubble constant by using two parameters - the B-V color and the rate of decline - to simultaneously standardize the luminosities of all nearby Cepheid-calibrated type Ia supernovae (SNe Ia) and those of a larger, more distant sample of 29 SNe Ia. Each group is treated in as similar a manner as possible in order to avoid systematic effects. A simultaneous minimization yields a standardized absolute luminosity of the Cepheid-calibrated supernovae as well as the Hubble constant obtained from the more distant sample. We find and a standardized absolute magnitude of -19.46. The sensitivity of to a metallicity dependence of the Cepheid-determined distances is investigated. The total uncertainty , dominated by uncertainties in the primary Cepheid distance indicator, is estimated to be 5 km/s Mpc^{-1}.

To appear in ApJ

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