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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
First-year sloan digital sky survey-ii supernova results: Hubble diagram and cosmological parameters
Astrophysical Journal, Supplement Series, Volume 185, No. 1, Year 2009
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Description
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z < 0.42, discovered during the first season (Fall 2005) of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. These data fill in the redshift "desert" between low- and high-redshift SN Ia surveys. Within the framework of the MLCS2K2 light-curve fitting method, we use the SDSS-II SN sample to infer the mean reddening parameter for host galaxies, RV = 2.18 0.14stat 0.48syst, and find that the intrinsic distribution of host-galaxy extinction is well fitted by an exponential function, P(AV ) = exp(-AV /τV), with τV = 0.334 0.088 mag. We combine the SDSS-II measurements with new distance estimates for published SN data from the ESSENCE survey, the Supernova Legacy Survey (SNLS), the Hubble Space Telescope (HST), and a compilation of Nearby SN Ia measurements. A new feature in our analysis is the use of detailed Monte Carlo simulations of all surveys to account for selection biases, including those from spectroscopic targeting. Combining the SN Hubble diagram with measurements of baryon acoustic oscillations from the SDSS Luminous Red Galaxy sample and with cosmic microwave background temperature anisotropy measurements from the Wilkinson Microwave Anisotropy Probe, we estimate the cosmological parameters w and ΩM, assuming a spatially flat cosmological model (FwCDM) with constant dark energy equation of state parameter, w. We also consider constraints upon ΩM and ΩΛ for a cosmological constant model (ΛCDM) with w = -1 and non-zero spatial curvature. For the FwCDM model and the combined sample of 288 SNe Ia, we find w = -0.76 0.07(stat) 0.11(syst), ΩM = 0.307 0.019(stat) 0.023(syst) using MLCS2K2 and w = -0.96 0.06(stat) 0.12(syst), ΩM = 0.265 0.016(stat) 0.025(syst) using the SALT-II fitter. We trace the discrepancy between these results to a difference in the rest-frame UV model combined with a different luminosity correction from color variations; these differences mostly affect the distance estimates for the SNLS and HST SNe. We present detailed discussions of systematic errors for both light-curve methods and find that they both show data-model discrepancies in rest-frame U band. For the SALT-II approach, we also see strong evidence for redshift-dependence of the color-luminosity parameter (β). Restricting the analysis to the 136 SNe Ia in the Nearby+SDSS-II samples, we find much better agreement between the two analysis methods but with larger uncertainties: w = -0.92 0.13(stat)+0.10-0.33(syst) for MLCS2K2 and w = -0.92 0.11(stat)+0.07-0.15 (syst) for SALT-II. © 2009. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Kessler, Richard S.
Unknown Affiliation
Becker, Andrew C.
Unknown Affiliation
Cinabro, David A.
Unknown Affiliation
VanderPlas, Jacob T.
Unknown Affiliation
Frieman, Joshua A.
Unknown Affiliation
Marriner, John P.
Unknown Affiliation
Davis, Tamara M.
Unknown Affiliation
Dilday, Benjamin
Unknown Affiliation
Holtzman, Jon A.
Unknown Affiliation
Jha, Saurabh W.
Unknown Affiliation
Lampeitl, Hubert
Unknown Affiliation
Sako, Masao
Unknown Affiliation
Smith, Matthew W.L.
Unknown Affiliation
Zheng, C.
Unknown Affiliation
Nichol, Robert C.
Unknown Affiliation
Bassett, Bruce A.C.C.
Unknown Affiliation
Bender, Ralf
Unknown Affiliation
DePoy, Darren L.
Unknown Affiliation
Doi, Mamoru
Unknown Affiliation
Elson, Edward C.
Unknown Affiliation
Filippenko, Alexei V.
Unknown Affiliation
Foley, Ryan J.F.
Unknown Affiliation
Garnavich, Peter M.
Unknown Affiliation
Hopp, Ulrich
Unknown Affiliation
Ihara, Yutaka
Unknown Affiliation
Ketzeback, William
Unknown Affiliation
Kollatschny, Wolfram
Unknown Affiliation
Konishi, Kohki
Unknown Affiliation
Marshall, Jennifer L.
Unknown Affiliation
McMillan, Russet J.
Unknown Affiliation
Miknaitis, Gajus
Unknown Affiliation
Morokuma, Tomoki
Unknown Affiliation
Mörtsell, Edvard
Unknown Affiliation
Pan, Kaike
Unknown Affiliation
Prieto, José Luis
Unknown Affiliation
Richmond, Michael W.
Unknown Affiliation
Riess, Adam G.
Unknown Affiliation
Romani, Roger W.R.
Unknown Affiliation
P. Schneider, Donald P.
Unknown Affiliation
Sollerman, Jesper
Unknown Affiliation
Takanashi, Naohiro
Unknown Affiliation
Tokita, Kouichi
Unknown Affiliation
van der Heyden, Kurt J.
Unknown Affiliation
Wheeler, J. Craig
Unknown Affiliation
Yasuda, Naoki
Unknown Affiliation
York, Donald G.
Unknown Affiliation
Statistics
Citations: 592
Authors: 46
Affiliations: 33
Identifiers
Doi:
10.1088/0067-0049/185/1/32
ISSN:
00670049
Study Design
Cross Sectional Study
Phenomenological Study
Study Approach
Quantitative