Cosmic microwave background anisotropy constraints on open and flat-A colddark matter cosmogonies from UCSB South Pole, ARGO, MAX, White Dish, and SuZIE data
B. Ratra et al., Cosmic microwave background anisotropy constraints on open and flat-A colddark matter cosmogonies from UCSB South Pole, ARGO, MAX, White Dish, and SuZIE data, ASTROPHYS J, 517(2), 1999, pp. 549-564
We use combinations of 10 small-scale cosmic microwave background anisotrop
y data sets from the UCSB South Pole 1994, ARGO, MAX 4 and 5, White Dish, a
nd SuZIE experiments to constrain cosmogonies. We consider open and spatial
ly flat-A cold dark matter cosmogonies with nonrelativistic mass density pa
rameter Omega(0) in the range 0.1-1, baryonic mass density parameter Omega(
B) in the range 0.005-0.029 h(-2), and age of the universe t(0) in the rang
e 10-20 Gyr. Marginalizing over all parameters but Omega(0) the combined da
ta favor a Omega(0) similar or equal to 1 (1) open (flat-Lambda) model. Exc
luding the smallest angular scale SuZIE data, an Omega(0) similar or equal
to 0.3 (1) open (flat-Lambda) model is favored. Considering only multifrequ
ency data with error bars consistent with sample variance and noise conside
rations, i.e., the South Pole 1994 Ka band, the MAX 4 iota Draconis, and th
e MAX 5 HR5127 data, an Omega(0) similar or equal to 0.1 (1) open (flat-Lam
bda) model is favored. For both open and flat-Lambda models and for all thr
ee combinations of data sets, after marginalizing over all other parameters
, a lower Omega(B)h(2) (similar to 0.005) or younger (t(0) similar to 10 Gy
r) universe is favored. However, the data do not rule out other values of O
mega(0) in the flat-Lambda model and other values of Omega(B)h(2) in both m
odels. At 2 sigma confidence, model normalizations deduced from the small-s
cale data are consistent with those derived from the Differential Microwave
Radiometer data. We emphasize that since we consider only a small number o
f data sets, these results are tentative.