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

Reichardt, C. L., Zahn, O., Ade, Peter A.R. ORCID: https://orcid.org/0000-0002-5127-0401, 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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Abstract

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:	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:	20 Oct 2022 09:59
URI:	https://orca.cardiff.ac.uk/id/eprint/33747

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