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Improved CosmologicalConstraints from New,Old, and CombinedSupernova Data Sets M. KowalskiD. RubinG. Aldering2008 год

Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets
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Аннотация: We present a new compilation of Type Ia supernovae (SNe Ia), a new dataset of low-redshift nearby-Hubble-flow SNe and new analysis procedures to work with these heterogeneous compilations. This ``Union'' compilation of 414 SN 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 datasets, as well as the recently extended dataset of distant supernovae observed with 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 $Ω_Λ= 0.713^{+0.027}_{-0.029} (stat)}^{+0.036}_{-0.039} (sys)}$, for a flat, LCDM 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.
Год издания: 2008
Авторы: M. Kowalski, D. Rubin, G. Aldering, R. Agostinho, Alexis Amadon, R. Amanullah, C. Balland, K. Barbary, Guillermo A. Blanc, Peter Challis, A. Conley, N. Connolly, R. Covarrubias, Kyle Dawson, Susana E. Deustua, Richard S. Ellis, S. Fabbro, V. Fadeyev, Xiaohui Fan, Brian D. Farris, G. Folatelli, Brenda Frye, G. Garavini, E. L. Gates, L. Germany, G. Goldhaber, B. Goldman, A. Goobar, D. E. Groom, J. Haïssinski, D. Hardin, I. Hook, S. Kent, Alex Kim, R. A. Knop, C. Lidman, E. Linder, Javier Méndez, J. Meyers, G. J. Miller, M. Moniez, A. Mourão, Heidi Jo Newberg, S. Nobili, P. Nugent, R. Pain, O. Perdereau, S. Perlmutter, M. M. Phillips, V. Prasad, R. Quimby, N. Regnault, J. Rich, Eric P. Rubenstein, P. Ruiz‐Lapuente, Filipe Duarte Santos, B. E. Schaefer, R. A. Schommer, R. C. Smith, Alicia Soderberg, A. L. Spadafora, Louis-Gregory Strolger, M. Strovink, N. B. Suntzeff, Norihiro Suzuki, R. C. Thomas, N. A. Walton, L. Wang, W. M. Wood‐Vasey, J. L. Yun
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Gamma-ray bursts and supernovae, Astrophysics and Cosmic Phenomena, Neutrino Physics Research
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