Journal
ASTROPHYSICAL JOURNAL
Volume 627, Issue 2, Pages 579-607Publisher
IOP PUBLISHING LTD
DOI: 10.1086/430497
Keywords
cosmology : observations; distance scale; galaxies : distances and redshifts; supernovae : general
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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 that 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) kms(-1) Mpc(-1). 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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