The Supernova Legacy Survey: measurement of $\Omega_{\mathsf{M}}$, $\Omega_\mathsf{\Lambda}$ and<i>w</i>from the first year data set
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Abstract
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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The record
- Venue
- Astronomy and Astrophysics
- Topic
- Gamma-ray bursts and supernovae
- Field
- Physics and Astronomy
- Canadian institutions
- University of TorontoUniversity of Victoria
- Funders
- Institut National de Physique Nucléaire et de Physique des ParticulesInstitut national des sciences de l'UniversComisión Nacional de Investigación Científica y TecnológicaFundação para a Ciência e a TecnologiaAustralian Research CouncilNuclear PhysicsNatural Sciences and Engineering Research Council of CanadaFrance-Berkeley FundCentre National de la Recherche ScientifiqueEuropean Southern ObservatoryConselho Nacional de Desenvolvimento Científico e TecnológicoCalifornia Institute of TechnologyU.S. Department of EnergyConsejo Nacional de Investigaciones Científicas y TécnicasOffice of ScienceNational Science Foundation
- Keywords
- PhysicsOmegaHubble's lawDark energyAstrophysicsRedshiftSkySupernovaCosmologyCosmic distance ladderBaryon acoustic oscillationsPhotometry (optics)LambdaAstronomyBaryonGalaxyStarsOptics
- Has abstract in OpenAlex
- yes