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Title:
Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant
Authors:
Riess, Adam G.; Li, Weidong; Stetson, Peter B.; Filippenko, Alexei V.; Jha, Saurabh; Kirshner, Robert P.; Challis, Peter M.; Garnavich, Peter M.; Chornock, Ryan
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; .), AB(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , .), AC(Herzberg Institute of Astrophysics, National Research Council, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada; .), AD(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , .), AE(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , .), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; .), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; .), AH(Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556-5670 .), AI(Department of Astronomy, University of California, 601 Campbell Hall, Berkeley, CA 94720-3411 , , , .)
Publication:
The Astrophysical Journal, Volume 627, Issue 2, pp. 579-607. (ApJ Homepage)
Publication Date:
07/2005
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Cosmology: Distance Scale, Galaxies: Distances and Redshifts, Stars: Supernovae: General
DOI:
10.1086/430497
Bibliographic Code:
2005ApJ...627..579R

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 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 H0=73+/-4(statistical)+/-5(systematic) km s-1 Mpc-1. 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.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.

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