Determination of the Hubble Constant Using a Two-Parameter Luminosity Correction for Type IA Supernovae
Abstract
In this paper, we make a comprehensive determination of the Hubble constant H0 by using two parameters--the B-V color and the rate of decline Δm15--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 χ2 minimization yields a standardized absolute luminosity of the Cepheid-calibrated supernovae as well as the Hubble constant obtained from the more distant sample. With an adopted LMC distance modulus of 18.50, we find H0=62 km s-1 Mpc-1 and a standardized absolute magnitude of -19.46. The sensitivity of H0 to a metallicity dependence of the Cepheid-determined distances is investigated. The total uncertainty δH0, dominated by uncertainties in the primary distance indicators, is estimated to be 5 km s-1 Mpc-1.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1999
- DOI:
- 10.1086/307883
- arXiv:
- arXiv:astro-ph/9904347
- Bibcode:
- 1999ApJ...525..209T
- Keywords:
-
- COSMOLOGY: DISTANCE SCALE;
- STARS: SUPERNOVAE: GENERAL;
- Cosmology: Distance Scale;
- Stars: Supernovae: General;
- Astrophysics
- E-Print:
- To appear in ApJ