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A.G. Riess (STScI/JHU), W. Li (UCB), P.B. Stetson (HIA), A.V. Filippenko (UCB), L. Greenhill (SAO), S. Jha (UCB)
We report observations of nearby Type Ia supernovae (SNe~Ia) for which ongoing observations of Cepheid variables in the host galaxies are being obtained with the Hubble Space Telescope. These SNe~Ia triple the sample of ``ideal'' luminosity calibrators: objects with well-observed and well-calibrated light curves of typical shape and with low reddening. By comparing them to all similarly well-measured SNe Ia in the Hubble flow, we have derived a much improved determination of the Hubble constant. A detailed analysis demonstrates that most of the past disagreement over the value of H0 as determined from SNe~Ia is abated by the replacement of past, problematic data by more accurate and precise, modern data.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.