Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

Full text for this resource is not available from the Research Repository.

Kowalski, M, Rubin, D, Aldering, Greg, Agostinho, R. J, Amadon, A, Amanullah, R, Balland, C, Barbary, K, Blanc, G, Challis, P. J, Conley, Alexander, Connolly, N. V, Covarrubias, R, Dawson, K. S, Deustua, S. E, Ellis, Richard S, Fabbro, S, Fadeyev, V, Fan, X, Farris, B, Folatelli, G, Frye, B. L, Garavini, G, Gates, E. L, Germany, Lisa, Goldhaber, G, Goldman, B, Goobar, A, Groom, D. E, Haissinski, J, Hardin, D, Hook, I. M, Kentish, Stephen M, Kim, A. G, Knop, R. A, Lidman, C, Linder, E. V, Mendez, J, Meyers, J, Miller, G. J, Moniez, M, Mourao, A. M, Newberg, H, Nobili, S, Nugent, P. E, Pain, R, Perdereau, O, Perlmutter, S, Phillips, M. M, Prasad, V, Quimby, Robert, Regnault, N, Rich, J, Rubenstein, E. P, Ruiz-Lapuente, P, Santos, F. D, Schaefer, B. E, Schommer, R. A, Smith, R. Chris, Soderberg, A. M, Spadafora, A. L, Strolger, Louis-Gregory, Strovink, M, Suntzeff, N. B, Suzuki, N, Thomas, R. C, Walton, N. A, Wang, L, Wood-Vasey, W. M and Yun, J. L (2008) Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets. The Astrophysical Journal, 686 (2). pp. 749-778. ISSN 0004-637X (print) 1538-4357 (online)

Abstract

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 ΩΛ = 0.713+ 0.027−0.029(stat)+ 0.036−0.039(sys) , for a flat, ΛCDM 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.

Dimensions Badge

Altmetric Badge

Item type Article
URI https://vuir.vu.edu.au/id/eprint/25314
DOI https://doi.org/10.1086/589937
Official URL http://iopscience.iop.org/0004-637X/686/2/749/pdf/...
Subjects Historical > FOR Classification > 0201 Astronomical and Space Sciences
Current > Division/Research > Other
Keywords cosmological parameters, cosmology, observations, supernovae, stars
Citations in Scopus 1126 - View on Scopus
Download/View statistics View download statistics for this item

Search Google Scholar

Repository staff login