Constraints on the High-ℓ Power Spectrum of Millimeter-Wave Anisotropies from APEX-SZ

C. L. Reichardt; O. Zahn; P. A. R. Ade; K. Basu; A. N. Bender; F. Bertoldi; H.-M. Cho; G. Chon; M. Dobbs; D. Ferrusca; N. W. Halverson; W. L. Holzapfel; C. Horellou; D. Johansson; B. R. Johnson; J. Kennedy; R. Kneissl; T. Lanting; A. T. Lee; M. Lueker; J. Mehl; K. M. Menten; M. Nord; F. Pacaud; P. L. Richards; R. Schaaf; D. Schwan; H. Spieler; A. Weiss; B. Westbrook

doi:10.1088/0004-637X/701/2/1958

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C. L. Reichardt et al. 2009 ApJ 701 1958 doi:10.1088/0004-637X/701/2/1958

CONSTRAINTS ON THE HIGH-ℓ POWER SPECTRUM OF MILLIMETER-WAVE ANISOTROPIES FROM APEX-SZ

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C. L. Reichardt¹, O. Zahn¹, P. A. R. Ade², K. Basu³, A. N. Bender⁴, F. Bertoldi⁵, H.-M. Cho⁶, G. Chon^3,5,7, M. Dobbs⁸, D. Ferrusca¹, N. W. Halverson^4,9, W. L. Holzapfel¹, C. Horellou¹⁰, D. Johansson¹⁰, B. R. Johnson¹, J. Kennedy⁸, R. Kneissl^3,11,12, T. Lanting², A. T. Lee^1,13, M. Lueker¹, J. Mehl¹⁴, K. M. Menten³, M. Nord^3,5, F. Pacaud⁵, P. L. Richards¹, R. Schaaf⁵, D. Schwan¹, H. Spieler¹³, A. Weiss³, and B. Westbrook¹

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¹ Department of Physics, University of California, Berkeley, CA 94720, USA
² School of Physics and Astronomy, Cardiff University, CF24 3YB, UK
³ Max Planck Institute for Radioastronomy, 53121 Bonn, Germany
⁴ Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309, USA
⁵ Argelander Institute for Astronomy, Bonn University, Bonn, Germany
⁶ National Institute of Standards and Technology, Boulder, CO 80305, USA
⁷ Max Planck Institute for Extraterrestrial Physics, 85748 Garching, Germany
⁸ Department of Physics, McGill University, Montréal, H3A 2T8, Canada
⁹ Department of Physics, University of Colorado, Boulder, CO 80309, USA
¹⁰ Onsala Space Observatory, Chalmers University of Technology, SE-439 92 Onsala, Sweden
¹¹ Joint ALMA Office, Av El Golf 40, Piso 18, Santiago, Chile
¹² ESO, Alonso de Cordova 3107, Vitacura, Santiago, Chile
¹³ Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
¹⁴ University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA

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Abstract References Cited By

We present measurements of the angular power spectrum of millimeter wave anisotropies with the APEX-SZ instrument. APEX-SZ has mapped 0.8 deg² 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 μK² 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 σ₈ = 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 μK² (1.7^+1.4 _–1.3 Jy² 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 $S_\nu \propto \nu ^{2.6^{+0.4}_{-0.2}}$ if both 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 σ₈ < 1.18 at 95% confidence.

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