We present 30 GHz measurements of the angular power spectrum of the cosmic microwave background (CMB) obtained with the Sunyaev-Zel'dovich Array. The measurements are sensitive to arcminute angular scales, where secondary anisotropy from the Sunyaev-Zel'dovich effect (SZE) is expected to dominate. For a broad bin centered at multipole 4066, we find 67+77 -50 μK2; of which 26 ± 5 μK2 is the expected contribution from primary CMB anisotropy and 80 ± 54 μK2 is the expected contribution from undetected radio sources. These results imply an upper limit of 155 μK2 (95% CL) on the secondary contribution to the anisotropy in our maps. This level of SZE anisotropy power is consistent with expectations based on recent determinations of the normalization of the matter power spectrum, i.e., σ ∼ 8 0.8.
- Cosmic background radiation
- Cosmological parameters
- Cosmology: observations
- Large-scale structure of universe
- Techniques: interferometric