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Constraints on the High -ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ

Reichardt, C. L., Zahn, O., Ade, Peter A.R., Basu, K., Bender, A. N., Bertoldi, F., Cho, H. M., Chon, G., Dobbs, M., Ferrusca, D., Halverson, N. W., Holzapfel, W. L., Horellou, C., Johansson, D., Johnson, B. R., Kennedy, J., Kneissl, R., Lanting, T., Lee, A. T., Lueker, M., Mehl, J., Menten, K. M., Nord, M., Pacaud, F., Richards, P. L., Schaaf, R., Schwan, D., Spieler, H., Weiss, A. and Westbrook, B. 2009. Constraints on the High -ℓ power spectrum of millimeter-wave anisotropies from APEX-SZ. Astrophysical Journal 701 (2) , pp. 1958-1964. 10.1088/0004-637X/701/2/1958

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We present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 deg(2) 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 < ℓ < 10, 000, limiting the total astronomical signal in a flat band power to be less than 105 μK(2) at 95% CL. We expect both submillimeter-bright, dusty galaxies and to a lesser extent secondary cosmic microwave background anisotropies from the Sunyaev-Zel'dovich effect (SZE) to significantly contribute to the observed power. Subtracting the SZE power spectrum expected for σ(8) = 0.8 and masking bright sources, the best-fit value for the remaining power is C( ℓ) = 1.1(+0.9) (–0.8) × 10(–5) μK(2) (1.7(+1.4)( –1.3) Jy(2) sr(–1)). This agrees well with model predictions for power due to submillimeter-bright, dusty galaxies. Comparing this power to the power detected by BLAST at 600 GHz, we find the frequency dependence of the source fluxes to be if both Sv ∝ v^(2.6 (0.4)/-0.2)) experiments measure the same population of sources. 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 σ(8) < 1.18 at 95% confidence.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: cosmic microwave background; cosmological parameters; cosmology: observations; infrared: galaxies
Publisher: IOPScience
ISSN: 0004-637X
Last Modified: 04 Jun 2017 04:09

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