OVRO CMB anisotropy measurement constraints on flat-λ and open CDM cosmogonies

Abstract

We use Owens Valley Radio Observatory (OVRO) cosmic microwave background (CMB) anisotropy data to constrain cosmological parameters. We account for the OVRO beamwidth and calibration uncertainties, as well as the uncertainty induced by the removal of non-CMB foreground contamination. 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 OVRO data favors an open (spatially-flat-Λ) model with Ω₀≃ 0.33 (0.1). At the 2σ confidence level model normalizations deduced from the OVRO data are mostly consistent with those deduced from the DMR, UCSB South Pole 1994, Python I-III, ARGO, MAX 4 and 5, White Dish, and SuZIE data sets.