The Hubble Constant from the Fornax Cluster Distance
Tom Richtler, Georg Drenkhahn, Matias Gomez, Wilhelm Seggewiss
Abstract
Type Ia supernovae are the best cosmological standard candles available. The intrinsic scatter of their decline-rate- and colour-corrected peak brightnesses in the Hubble diagram is within observational error limits, corresponding to an uncertainty of only 3km/s/Mpc of the Hubble constant. Any additional uncertainty, resulting from peak-brightness calibration, must be kept small by measuring distances to nearby host galaxies most precisely. A number of different distance determinations of the Fornax cluster of galaxies agree well on a distance modulus of 31.35+-0.04mag (18.6+-0.3Mpc). This leads to accurate absolute magnitudes of the well-observed Fornax type Ia SNe SN1980N, SN1981D, and SN1992A and finally to a Hubble constant of H0=72+-6km/s/Mpc.
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