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The Supernova Legacy Survey: measurement of $\Omega_{\mathsf{M}}$, $\Omega_\mathsf{\Lambda}$ and<i>w</i>from the first year data set

P. AstierLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]J. GuyLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]N. RegnaultLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]R. PainLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]É. AubourgAPC, Collège de France, 11 place Marcellin Berthelot, 75005 Paris, FranceD. D. BalamDepartment of Physics and Astronomy, University of Victoria, PO Box 3055, Victoria, BC VSW 3P6, CanadaS. BasaLAM, CNRS, BP8, Traverse du Siphon, 13376 Marseille Cedex 12, FranceR. G. CarlbergDepartment of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CanadaS. FabbroCENTRA-Centro M. de Astrofisica and Department of Physics, IST, Lisbon, PortugalD. FouchezCPPM, CNRS-IN2P3 and Université Aix-Marseille II, Case 907, 13288 Marseille Cedex 9, FranceI. HookUniversity of Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKD. A. HowellDepartment of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CanadaH. LafouxDSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, FranceJames D. NeillDepartment of Physics and Astronomy, University of Victoria, PO Box 3055, Victoria, BC VSW 3P6, CanadaN. Palanque‐DelabrouilleDSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, FranceK. PerrettDepartment of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CanadaC. J. PritchetDepartment of Physics and Astronomy, University of Victoria, PO Box 3055, Victoria, BC VSW 3P6, CanadaJ. RichDSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, FranceM. SullivanDepartment of Astronomy and Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, CanadaR. TailletLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]G. AlderingLBNL, 1 Cyclotron Rd, Berkeley, CA 94720, USAP. AntilogusLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]V. ArsenijevicCENTRA-Centro M. de Astrofisica and Department of Physics, IST, Lisbon, PortugalC. BallandAPC, Collège de France, 11 place Marcellin Berthelot, 75005 Paris, FranceS. BaumontESO, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, ChileJ. BronderUniversity of Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKH. M. CourtoisCRAL, 9 avenue Charles André, 69561 Saint-Genis-Laval cedex, FranceRichard S. EllisCalifornia Institute of Technology, Pasadena, California, USAM. FiliolLAM, CNRS, BP8, Traverse du Siphon, 13376 Marseille Cedex 12, FranceA. C. GonçalvesLUTH, UMR 8102, CNRS and Observatoire de Paris, 92195 Meudon, FranceA. GoobarDepartment of Physics, Stockholm University, SwedenD. GuideLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]D. HardinLPNHE, CNRS-IN2P3 and Universités Paris VI & VII, 4 place Jussieu, 75252 Paris Cedex 05, France; e-mail: [email protected]V. LussetDSM/DAPNIA, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, FranceC. LidmanR. G. McMahonIoA, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UKM. MouchetAPC, Collège de France, 11 place Marcellin Berthelot, 75005 Paris, FranceA. MourãoCENTRA-Centro M. de Astrofisica and Department of Physics, IST, Lisbon, PortugalS. PerlmutterDepartment of Physics, University of California Berkeley, Berkeley, CA 94720, USAP. RipocheCPPM, CNRS-IN2P3 and Université Aix-Marseille II, Case 907, 13288 Marseille Cedex 9, FranceC. TaoCPPM, CNRS-IN2P3 and Université Aix-Marseille II, Case 907, 13288 Marseille Cedex 9, FranceN. A. WaltonIoA, University of Cambridge, Madingley Road, Cambridge CB3 0EZ, UK

2006en

ABI

Annotatsiya

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 , 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: for a flat ΛCDM model; and 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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DOI: 10.1051/0004-6361:20054185

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