Constraints on the High-` Power Spectrum of Millimeter-wave Anisotropies from Apex-sz
نویسندگان
چکیده
We present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 square degrees of sky at a frequency of 150 GHz with an angular resolution of 1′. These new measurements significantly improve the constraints on anisotropy power at 150 GHz over the range of angular multipoles 3000 < ` < 10, 000, limiting the total astronomical signal in a flat band power to be less than 105 μK at 95% CL. We expect both submillimeter-bright, dusty galaxies and secondary CMB anisotropies from the Sunyaev-Zel’dovich effect (SZE) to significantly contribute to the observed power. Subtracting the SZE power spectrum expected for σ8 = 0.8 and masking bright sources, the best fit value for the remaining power is C` = 1.1 −0.8 × 10−5 μK (1.7 +1.4 −1.3 Jy 2 sr−1). This agrees well with model predictions for power due to submillimeter-bright, dusty galaxies. Simultaneously fitting for the amplitude of the SZE power spectrum and a Poisson distributed point source population, we place an upper limit on the matter fluctuation amplitude of σ8 < 1.18 at 95% confidence. Subject headings: cosmic microwave background — cosmology:observations — cosmology: cosmological parameters — infrared: galaxies
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