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26 April 2024 |
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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
; | | Date: |
7 Mar 2005 | | Journal: | Astrophys.J. 627 (2005) 579-607 | | Subject: | astro-ph | | Affiliation: | STScI), Weidong Li (UCB), Peter B. Stetson (HIA), Alexei V. Filippenko (UCB), Saurabh Jha (UCB), Robert P. Kirshner (CfA), Peter M. Challis (CfA), Peter M. Garnavich (Notre Dame), Ryan Chornock (UCB | | 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. | | Source: | arXiv, astro-ph/0503159 | | Services: | Forum | Review | PDF | Favorites | |
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