The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda,and w from the First Year Data Set
作者： P. Astier , J. Guy , N. Regnault , R. Pain , E. Aubourg
DOI: 10.1051/0004-6361:20054185
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摘要: We present distance measurements to 71 high redshift type Ia supernovae discovered during the first year of 5-year Supernova Legacy Survey (SNLS). These events were detected and their multi-color light-curves measured using MegaPrime/MegaCam instrument at Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in bands. Follow-up spectroscopy was performed VLT, Gemini Keck telescopes confirm nature measure redshift. With this data set, we have built a Hubble diagram extending z = 1, with all involving least two Systematic uncertainties are evaluated making use multiband photometry obtained CFHT. Cosmological fits SNLS give following results: {Omega}{sub M} 0.263 {+-} 0.042 (stat) 0.032 (sys) for flat {Lambda}CDM model; w -1.023 0.090 0.054 cosmology constant equation state when combined constraint from recent Sloan Digital Sky measurement baryon acoustic oscillations.
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