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Centro de Astrofísica da Universidade do Porto

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

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 ΩB 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

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