The Supernova Legacy Survey: Measurement of $\Omega_M$, $\Omega_\Lambda$ and w from the First Year Data Set - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2006

The Supernova Legacy Survey: Measurement of $\Omega_M$, $\Omega_\Lambda$ and w from the First Year Data Set

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D. Balam
  • Function : Author
R.G. Carlberg
  • Function : Author
S. Fabbro
  • Function : Author
I.M. Hook
  • Function : Author
D.A. Howell
  • Function : Author
H. Lafoux
  • Function : Author
J.D. Neill
  • Function : Author
N. Palanque-Delabrouille
  • Function : Author
K. Perrett
  • Function : Author
C.J. Pritchet
  • Function : Author
J. Rich
  • Function : Author
M. Sullivan
  • Function : Author
G. Aldering
  • Function : Author
V. Arsenijevic
  • Function : Author
S. Baumont
  • Function : Author
J. Bronder
  • Function : Author
Hélène M. Courtois
  • Function : Author
R.S. Ellis
  • Function : Author
A.C. Goncalves
  • Function : Author
A. Goobar
  • Function : Author
V. Lusset
  • Function : Author
C. Lidman
  • Function : Author
R. Mcmahon
  • Function : Author
A. Mourao
  • Function : Author
S. Perlmutter
  • Function : Author
N. Walton
  • Function : Author

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. 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.

Dates and versions

in2p3-00025162 , version 1 (09-06-2007)

Identifiers

Cite

P. Astier, J. Guy, N. Regnault, R. Pain, E. Aubourg, et al.. The Supernova Legacy Survey: Measurement of $\Omega_M$, $\Omega_\Lambda$ and w from the First Year Data Set. Astronomy and Astrophysics - A&A, 2006, 447, pp.31-48. ⟨10.1051/0004-6361:20054185⟩. ⟨in2p3-00025162⟩
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