Fig. 17 from Improved Cosmological Constraints from New, Old, and Combined Supernova Data Sets

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

Authors: M. Kowalski, D. Rubin, G. Aldering, R. J. Agostinho, A. Amadon, R. Amanullah, C. Balland, K. Barbary, G. Blanc, P. J. Challis, A. Conley, N. V. Connolly, R. Covarrubias, K. S. Dawson, S. E. Deustua, R. Ellis, S. Fabbro, V. Fadeyev, X. Fan, B. Farris, G. Folatelli, B. L. Frye, G. Garavini, E. L. Gates, L. Germany, G. Goldhaber, B. Goldman, A. Goobar, D. E. Groom, J. Haissinski, D. Hardin, I. Hook, S. Kent, A. G. Kim, R. A. Knop, C. Lidman, E. V. Linder, J. Mendez, J. Meyers, G. J. Miller, M. Moniez, A. M. Mourão, H. Newberg, S. Nobili, P. E. Nugent, R. Pain, O. Perdereau, S. Perlmutter, M. M. Phillips, V. Prasad, R. Quimby, N. Regnault, J. Rich, E. P. Rubenstein, P. Ruiz-Lapuente, F. D. Santos, B. E. Schaefer, R. A. Schommer, R. C. Smith, A. M. Soderberg, A. L. Spadafora, L.-G. Strolger, M. Strovink, N. B. Suntzeff, N. Suzuki, R. C. Thomas, N. A. Walton, L. Wang, W. M. Wood-Vasey, and J. L. Yun

Kowalski et al. 2008 The Astrophysical Journal 686 749.

Provider: AAS Journals

Caption: Fig. 17.

Constraints at 68% confidence level on ﹩w( z) ﹩, where ﹩w( z) ﹩ is assumed to be constant over each redshift bin. The left column combines the Union SN set with BAO constraints only, while the right column includes also constraints from the CMB. The top row illustrates the fact that only extremely weak constraints on the equation of state exist at ﹩z> 1﹩. The bottom row shows a different binning that minimizes the mean bin error. Note that for ﹩z> 2﹩ (dark gray: No SN constraint) only upper limits exist, basically enforcing matter domination, coming from either CMB data or, in the case without CMB data, from requiring substantial structure formation (a linear growth factor within a factor of 10 of that observed).

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