Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant 1

@inproceedings{Riess2005CepheidCF,
  title={Cepheid Calibrations from the Hubble Space Telescope of the Luminosity of Two Recent Type Ia Supernovae and a Re-determination of the Hubble Constant 1},
  author={Adam G. Riess and Weidong Li and Peter B. Stetson and Alexei V. Filippenko and Saurabh Jha and Robert P. Kirshner and Peter M. Challis and Peter M. Garnavich and Ryan Chornock},
  year={2005}
}
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… CONTINUE READING