Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant

Details Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant

2005-03-07

arxiv.org/abs/astro-ph/0503159v2

Astrophys.J. 627 (2005) 579-607

Astronomy and Astrophysics

Astrophysics

Accepted to ApJ, 66 pages, truncated data tables, 12 figures (some condensed to jpeg)

Scientific paper

10.1086/430497

We report observations of two nearby Type Ia supernovae (SNe Ia) for which observations of Cepheid variables in the host galaxies have been obtained with the Hubble Space Telescope: SN 1994ae in NGC 3370 and SN 1998aq in NGC 3982. For NCG 3370, we used the Advanced Camera for Surveys to observe 64 Cepheids that yield a distance of 29 Mpc, the farthest direct measurement of Cepheids. We have measured emission lines from H II regions in both host galaxies which provide metallicity-dependent corrections to their period-luminosity relations. These two SNe Ia double 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 find that H_0 = 73 +/- 4 (statistical) +/- 5 (systematic). A detailed analysis demonstrates that most of the past disagreement over the value of H_0 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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