UCSB South Pole 1994 Cosmic Microwave Background Anisotropy Measurement Constraints on Open and FlatΛ Cold Dark Matter Cosmogonies
Abstract
We develop methods to account for experimental and observational uncertainties in likelihood analyses of data from cosmic microwave background (CMB) anisotropy experiments and apply them to an analysis of the UCSB South Pole 1994 (SP94) experiment. Observationally motivated open and spatially flat Λ, cold dark matter cosmogonies are considered. Among the models we consider, the full SP94 data set is most consistent with Ω_{0} ~ 0.10.2 open models and less so with old (t_{0} >~ 1516 Gyr), high baryon density (Ω_{B} >~ 0.0175 h^{2}), low density (Ω_{0} ~ 0.20.4), flatΛ models. The SP94 data do not rule out any of the models we consider at the 2 σ level. The SP94 experiment is most sensitive to anisotropies on a somewhat larger, modeldependent, angular scale than the scale at which the window function peaks.
For establishing the significance of a detection of CMB anisotropy we derive limits using the highest posterior density (HPD) prescription, since it yields smaller lower limits. Since HPD limits lead to tighter constraints on the CMB amplitude, they also provide for greater discrimination between models. Model normalizations deduced from the SP94 data subsets are mostly consistent with those deduced from the 2 yr COBEDMR data, although the Kaband data prefer a normalization ~1 σ lower than do the Qband data, the Q and Ka + Q data favor a slightly higher normalization for the Ω_{0} = 0.1 open model than does the DMR, and the Ka and Ka + Q data prefer a somewhat lower normalization for the older, higher Ω_{B}, lowdensity Λ models than does the DMR.
 Publication:

The Astrophysical Journal
 Pub Date:
 July 1997
 DOI:
 10.1086/304296
 arXiv:
 arXiv:astroph/9602141
 Bibcode:
 1997ApJ...484....7G
 Keywords:

 Cosmology: Cosmic Microwave Background;
 Cosmology: Observations;
 Cosmology: LargeScale Structure of Universe;
 Astrophysics
 EPrint:
 Substantially shortened and rewritten. Accepted by ApJ. PostScript. 49 pages of text + tables. 16 pages of figures