HST Cepheid Calibrations of the Luminosity of Ideal SNe Ia and a Redetermination of the Hubble Constant

Details HST Cepheid Calibrations of the Luminosity of Ideal SNe Ia and a Redetermination of the Hubble Constant HST Cepheid Calibrations of the Luminosity of Ideal SNe Ia and a Redetermination of the Hubble Constant

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718010r&link_type=abstract

American Astronomical Society Meeting 207, #180.10; Bulletin of the American Astronomical Society, Vol. 37, p.1460

Astronomy and Astrophysics

Astronomy

2

Scientific paper

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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