The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set

Details The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda and w from the First Year Data Set

2005-10-14

arxiv.org/abs/astro-ph/0510447v1

Astron.Astrophys.447:31-48,2006

Astronomy and Astrophysics

Astrophysics

(The SNLS Collaboration) 24 pages, 13 figures, Accepted in A&A. Computer readable tables at http://snls.in2p3.fr/conf/papers/c

Scientific paper

10.1051/0004-6361:20054185

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 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 LambdaCDM 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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