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

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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 ... continued below

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Astier, P.; Guy, J.; Regnault, N.; Pain, R.; Aubourg, E.; Balam,D. et al. October 14, 2005.

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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 multiband photometry obtained at CFHT. Cosmological fits to this first year SNLS Hubble diagram give the following results: {Omega}{sub M} = 0.263 {+-} 0.042 (stat) {+-} 0.032 (sys) for a flat {Lambda}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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  • Journal Name: Astronomy and Astrophysics; Journal Volume: 447; Journal Issue: 1; Related Information: Journal Publication Date: 02/2006

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  • Report No.: LBNL--59164
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 876215
  • Archival Resource Key: ark:/67531/metadc880237

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  • October 14, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:16 p.m.

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Astier, P.; Guy, J.; Regnault, N.; Pain, R.; Aubourg, E.; Balam,D. et al. The Supernova Legacy Survey: Measurement of Omega_M, Omega_Lambda,and w from the First Year Data Set, article, October 14, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc880237/: accessed October 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.