期刊
ASTRONOMY & ASTROPHYSICS
卷 447, 期 1, 页码 31-U31出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20054185
关键词
supernovae : general; cosmology : observations; cosmological parameters
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, as part of the CFHT Legacy Survey (CFHTLS). 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 multi-band photometry obtained at CFHT. Cosmological fits to this first year SNLS Hubble diagram give the following results: Omega(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.
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