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

Adam G. Riess; Weidong Li; Peter B. Stetson; Alexei V. Filippenko; Saurabh Jha; Robert P. Kirshner; Peter M. Challis; Peter M. Garnavich; Ryan Chornock

doi:10.1086/430497

arXiv · astro-ph/0503159

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

Adam G. Riess·Weidong Li·Peter B. Stetson·Alexei V. Filippenko·Saurabh Jha·Robert P. Kirshner·Peter M. Challis·Peter M. Garnavich·Ryan Chornock

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Abstract

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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Adam G. Riess, Weidong Li, Peter B. Stetson, Alexei V. Filippenko, Saurabh Jha, Robert P. Kirshner, Peter M. Challis, Peter M. Garnavich, Ryan Chornock. 2005-03-07. Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant. https://doi.org/10.1086/430497

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