425 K
24 pp.
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TitleThe Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda, and w from the First Year Data Set
Author(s)Astier, P.; Guy, J.; Regnault, N.; Pain, R.; Aubourg, E.; Balam, D.; Basa, S.; Carlberg, R. G.; Fabbro, S.; Fouchez, D.; Hook, I. M.; Howell, D. A.; Lafoux, H.; Neill, J. D.; Palanque-Delabrouille, N.; Perrett, K.; Pritchet, C. J.; Rich, J.; Sullivan, M.; Taillet, R.; Aldering, G.; Antilogus, P.; Arsenijevic, V.; Balland, C.; Baumont, S.; Bronder, J.; Courtois, H.; Ellis, R. S.; Filiol, M.; Goncalves, A. C.; Goobar, A.; Guide, D.; Hardin, D.; Lusset, V.; Lidman, C.; McMahon, R.; Mouchet, M.; Mourao, A.; Perlmutter, S.; Ripoche, P.; Tao, C.; Walton, N.
Publication DateOctober 14, 2005
Report NumberLBNL--59164
Unique IdentifierACC0428
Other NumbersOSTI ID: 876215
Research OrgLawrence Berkeley National Laboratory (LBNL), Berkeley, CA (US)
Contract NoAC02-05CH11231
Sponsoring OrgDirector, Office of Science, Office of High Energy Physics, U.S. Department of Energy (DOE); Fundacao para a Ciencia e Tecnologia Portugal POCTI/FNU/43423 and Grants SFRH/BPD/14682/2003 and SFRH/BPD/11641/2002
Subject71 Classical and Quantum Mechanics, General Physics; 72 Physics of Elementary Particles and Fields; Acoustics; Baryons; Cosmology; Oscillations; Photometry; Sky; Spectroscopy; Supernovae; Telescopes
KeywordsGeneral Cosmology; Observations
Related Web PagesSaul Perlmutter, Distant Supernovae, Dark Energy, and the Accelerating Expansion of the Universe
AbstractWe present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of the 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in four bands. Follow-up spectroscopy was performed at the VLT, Gemini and Keck telescopes to confirm the nature of the supernovae and to measure their redshift. With this data set, we have built a Hubble diagram extending to z = 1, with all distance measurements involving at least two bands. Systematic uncertainties are evaluated making use of the multiband photometry obtained at CFHT. Cosmological fits to this first year SNLS Hubble diagram give the following results: {Omega}{sub M} = 0.263 {+-} 0.042 (stat) {+-} 0.032 (sys) for a flat {Lambda}CDM model; and w = -1.023 {+-} 0.090 (stat) {+-} 0.054 (sys) for a flat cosmology with constant equation of state w when combined with the constraint from the recent Sloan Digital Sky Survey measurement of baryon acoustic oscillations.
425 K
24 pp.
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