FIRST-YEAR SLOAN DIGITAL SKY SURVEY-II SUPERNOVA RESULTS: HUBBLE DIAGRAM AND COSMOLOGICAL PARAMETERS

Journal Article · Sun Nov 01 00:00:00 EDT 2009 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/185/1/32; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21301537

Kessler, Richard; Frieman, Joshua A ^[1]; Becker, Andrew C; Vanderplas, Jake ^[2]; Cinabro, David ^[3]; Marriner, John ^[4]; Davis, Tamara M ^[5]; Dilday, Benjamin; Jha, Saurabh W ^[6]; Holtzman, Jon ^[7]; Lampeitl, Hubert; Smith, Mathew; Nichol, Robert C ^[8]; Sako, Masao ^[9]; Chen, Zheng ^[10]; Bassett, Bruce; Elson, Ed ^[11]; Bender, Ralf ^[12]; Depoy, Darren L ^[13]; Doi, Mamoru ^[14]

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1. Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Ave., Chicago, IL 60637 (United States)
2. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)
3. Department of Physics and Astronomy, Wayne State University, Detroit, MI 48202 (United States)
4. Center for Particle Astrophysics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States)
5. School of Mathematics and Physics, University of Queensland, QLD 4072 (Australia)
6. Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854 (United States)
7. Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003 (United States)
8. Institute of Cosmology and Gravitation, Dennis Sciama Building, Burnaby Road, University of Portsmouth, Portsmouth PO1 3FX (United Kingdom)
9. Department of Physics and Astronomy, University of Pennsylvania, 203 South 33rd Street, Philadelphia, PA 19104 (United States)
10. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305-4060 (United States)
11. Department of Mathematics and Applied Mathematics, University of Cape Town, Rondebosch 7701 (South Africa)
12. Universitaets-Sternwarte, Ludwig-Maximilians Universitaet Muenchen (Germany)
13. Department of Physics, Texas A and M University, College Station, TX 77843 (United States)
14. Institute of Astronomy, University of Tokyo, 2-21-1 Osawa, Mitaka-shi, Tokyo, 181-0015 (Japan)

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, R{sub V} = 2.18 {+-} 0.14{sub stat} {+-} 0.48{sub syst}, and find that the intrinsic distribution of host-galaxy extinction is well fitted by an exponential function, P(A{sub V} ) = exp(-A{sub V} /{tau}{sub V}), with {tau}{sub V} = 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 {omega}{sub M}, assuming a spatially flat cosmological model (FwCDM) with constant dark energy equation of state parameter, w. We also consider constraints upon {omega}{sub M} and {omega}{sub {lambda}} for a cosmological constant model ({lambda}CDM) 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), {omega}{sub M} = 0.307 {+-} 0.019(stat) {+-} 0.023(syst) using MLCS2K2 and w = -0.96 {+-} 0.06(stat) {+-} 0.12(syst), {omega}{sub M} = 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 ({beta}). 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){sup +0.10} {sub -0.33}(syst) for MLCS2K2 and w = -0.92 {+-} 0.11(stat){sup +0.07} {sub -0.15} (syst) for SALT-II.

• OSTI ID: 21301537
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 185, Issue 1; Other Information: DOI: 10.1088/0067-0049/185/1/32; Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ANISOTROPY
BARYONS
COLOR
COMPUTERIZED SIMULATION
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
DATA ANALYSIS
EQUATIONS OF STATE
GALAXIES
LUMINOSITY
MONTE CARLO METHOD
NONLUMINOUS MATTER
OSCILLATIONS
RED SHIFT
RELICT RADIATION
SUPERNOVAE
TELESCOPES