ARGO Cosmic Microwave Background Anisotropy Measurement Constraints on Open and Flat‐Λ Cold Dark Matter Cosmogonies

Abstract

We use data from the ARGO cosmic microwave background (CMB) anisotropy experiment to constrain cosmogonies. We account for the ARGO beamwidth and calibration uncertainties, and we marginalize over the o †set removed from the data. Our derived amplitudes of the CMB anisotropy detected by the ARGO experiment are smaller than those derived previously. We consider open and spatially Ñat-" cold dark matter cosmogonies, with the clustered-mass density parameter in the range ) 0 0.1È1, the baryonic-mass density parameter in the range 0.005È0.029 h~2, and the age of the universe ) B in the range 10È20 Gyr. Marginalizing over all parameters but the ARGO data favor an open t 0 ) 0 , (spatially Ñat-") model with (0.1). However, these numerical values are model dependent. At ) 0 \ 0.23 the 2 p conÐdence level, model normalizations deduced from the ARGO data are consistent with those drawn from the UCSB South Pole 1994, MAX 4 ] 5, White Dish, and SuZIE data sets. The ARGO open-model normalizations are also consistent with those deduced from the Di †erential Microwave Radiometer (DMR) data. However, for most spatially Ñat-" models, the DMR normalizations are more than 2 p above the ARGO ones. Subject headings : cosmic microwave background È cosmology : observations È large-scale structure of universe

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