Python I, II, and III Cosmic Microwave Background Anisotropy Measurement Constraints on Open and Flat-Λ Cold Dark Matter Cosmogonies

G. Rocha, R. Stompor, K. Ganga, B. Ratra, S. R. Platt, N. Sugiyama, K. Górski

Abstract
We use Python I, II, and III cosmic microwave background anisotropy data to constrain cosmogonies. We account for the Python beamwidth and calibration uncertainties. We consider open and spatially flat-Λ cold dark matter cosmogonies, with nonrelativistic mass density parameter Ω₀ in the range 0.1-1, baryonic mass density parameter Ω_B in the range (0.005-0.029) h^-2, and age of the universe t0 in the range (10-20) Gyr. Marginalizing over all parameters but Ω₀, the combined Python data favor an open (spatially flat-Λ) model with Ω₀~=0.2 (0.1). At the 2 σ confidence level, model normalizations deduced from the combined Python data are mostly consistent with those drawn from the DMR, UCSB South Pole 1994, ARGO, MAX 4 and 5, White Dish, and SuZIE data sets.

The Astrophysical Journal
Volume 525, Page 1
November 1999