SNLS: Measurement of Ω M, Ω Λ and w from the First Year Data Set

Details SNLS: Measurement of Ω M, Ω Λ and w from the First Year Data Set SNLS: Measurement of Ω M, Ω Λ and w from the First Year Data Set

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.1504a&link_type=abstract

American Astronomical Society Meeting 207, #15.04; Bulletin of the American Astronomical Society, Vol. 37, p.1176

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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 : w = 0.263 ± 0.042(stat) ± 0.032(sys) for a flat Λ 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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