ARGO CMB Anisotropy Measurement Constraints on Open and Flat-Λ CDM

• Main Authors: Bharat Ratra, Ken Ganga, Naoshi Sugiyama, Paolo De Bernardis, Krzysztof M. Górski
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 1998
• Subjects: South Pole; South pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.317.8822; http://arxiv.org/pdf/astro-ph/9807298v1.pdf

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 marginalize over the offset 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-flat-Λ cold dark matter cosmogonies, with clustered-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 ARGO data favors an open (spatially-flat-Λ) model with Ω0 = 0.23 (0.1). However, these numerical values are model dependent. At the 2 σ confidence 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 DMR data. However, for most spatially-flat-Λ models the DMR normalizations are more than 2 σ above the ARGO ones. Subject headings: cosmic microwave background—cosmology: observations—large-scale structure of the universe 1