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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 421602.0, MPI für Astronomie / Publikationen_mpia
Improved cosmological constraints from new, old, and combined supernova data sets
Authors:Kowalski, M.; Rubin, D.; Aldering, G.; Agostinho, R. J.; Amadon, A.; Amanullah, R.; Balland, C.; Barbary, K.; Blanc, G.; Challis, P. J.; Conley, A.; Connolly, N. V.; Covarrubias, R.; Dawson, K. S.; Deustua, S. E.; Ellis, R.; Fabbro, S.; Fadeyev, V.; Fan, X.; Farris, B.; Folatelli, G.; Frye, B. L.; Garavini, G.; Gates, E. L.; Germany, L.; Goldhaber, G.; Goldman, B.; Goobar, A.; Groom, D. E.; Haissinski, J.; Hardin, D.; Hook, I.; Kent, S.; Kim, A. G.; Knop, R. A.; Lidman, C.; Linder, E. V.; Mendez, J.; Meyers, J.; Miller, G. J.; Moniez, M.; Mourão, A. M.; Newberg, H.; Nobili, S.; Nugent, P. E.; Pain, R.; Perdereau, O.; Perlmutter, S.; Phillips, M. M.; Prasad, V.; Quimby, R.; Regnault, N.; Rich, J.; Rubenstein, E. P.; Ruiz-Lapuente, P.; Santos, F. D.; Schaefer, B. E.; Schommer, R. A.; Smith, R. C.; Soderberg, A. M.; Spadafora, A. L.; Strolger, L. G.; Strovink, M.; Suntzeff, N. B.; Suzuki, N.; Thomas, R. C.; Walton, N. A.; Wang, L.; Wood-Vasey, W. M.; Yun, J. L.
Language:English
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astrophysical Journal
Volume:686
Start Page:749
End Page:778
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a new compilation of Type Ia supernovae (SNe Ia), a new data set of low-redshift nearby-Hubble-flow SNe, and new analysis procedures to work with these heterogeneous compilations. This ``Union'' compilation of 414 SNe Ia, which reduces to 307 SNe after selection cuts, includes the recent large samples of SNe Ia from the Supernova Legacy Survey and ESSENCE Survey, the older data sets, as well as the recently extended data set of distant supernovae observed with the Hubble Space Telescope (HST). A single, consistent, and blind analysis procedure is used for all the various SN Ia subsamples, and a new procedure is implemented that consistently weights the heterogeneous data sets and rejects outliers. We present the latest results from this Union compilation and discuss the cosmological constraints from this new compilation and its combination with other cosmological measurements (CMB and BAO). The constraint we obtain from supernovae on the dark energy density is OmegaLambda=0.713+0.027-0.029(stat)+0.036-0.039(sys), for a flat, LambdaCDM universe. Assuming a constant equation of state parameter, w, the combined constraints from SNe, BAO, and CMB give w=-0.969+0.059-0.063(stat)+0.063-0.066(sys). While our results are consistent with a cosmological constant, we obtain only relatively weak constraints on a w that varies with redshift. In particular, the current SN data do not yet significantly constrain w at z>1. With the addition of our new nearby Hubble-flow SNe Ia, these resulting cosmological constraints are currently the tightest available.
Free Keywords:Cosmology: Cosmological Parameters; Cosmology: Observations; Stars: Supernovae: General
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008ApJ...686..749K [ID No:1]
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