Cepheid Calibrations from theHubble Space Telescopeof the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant | Zendy

Adam G. Riess | Zendy; Weidong Li | Zendy; P. B. Stetson | Zendy; A. V. Filippenko | Zendy; Saurabh W. Jha | Zendy; R. Kirshner | Zendy; P. Challis | Zendy; P. Garnavich | Zendy; R. Chornock | Zendy

Open Access

Cepheid Calibrations from theHubble Space Telescopeof the Luminosity of Two Recent Type Ia Supernovae and a Redetermination of the Hubble Constant

Author(s) -

Adam G. Riess,

Weidong Li,

P. B. Stetson,

A. V. Filippenko,

Saurabh W. Jha,

R. Kirshner,

P. Challis,

P. Garnavich,

R. Chornock

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/430497

Subject(s) - cepheid variable , hubble's law , hubble space telescope , physics , supernova , hubble ultra deep field , astrophysics , luminosity , astronomy , hubble deep field , type (biology) , constant (computer programming) , cosmology , stars , galaxy , computer science , geology , dark energy , paleontology , programming language

We report observations of two nearby Type Ia supernovae (SNe Ia) for whichobservations of Cepheid variables in the host galaxies have been obtained withthe 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 Cepheidsthat 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 whichprovide metallicity-dependent corrections to their period-luminosity relations.These two SNe Ia double the sample of ``ideal'' luminosity calibrators: objectswith well-observed and well-calibrated light curves of typical shape and withlow reddening. By comparing them to all similarly well-measured SNe Ia in theHubble flow, we find that H_0 = 73 +/- 4 (statistical) +/- 5 (systematic). Adetailed analysis demonstrates that most of the past disagreement over thevalue of H_0 as determined from SNe Ia is abated by the replacement of past,problematic data by more accurate and precise, modern data.Comment: Accepted to ApJ, 66 pages, truncated data tables, 12 figures (some condensed to jpeg

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