24 pp.
24 pp.
| 425 K 24 pp. | |
| View Document | ||
| Title | The 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 Date | October 14, 2005 | |
| Report Number | LBNL--59164 | |
| Unique Identifier | ACC0428 | |
| Other Numbers | OSTI ID: 876215 | |
| Research Org | Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (US) | |
| Contract No | AC02-05CH11231 | |
| Sponsoring Org | Director, 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 | |
| Subject | 71 Classical and Quantum Mechanics, General Physics; 72 Physics of Elementary Particles and Fields; Acoustics; Baryons; Cosmology; Oscillations; Photometry; Sky; Spectroscopy; Supernovae; Telescopes | |
| Keywords | General Cosmology; Observations | |
| Related Web Pages | Saul Perlmutter, Distant Supernovae, Dark Energy, and the Accelerating Expansion of the Universe | |
| Abstract | We 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. | |
| View Document | ||
