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The cosmic microwave background anisotropy power spectrum measured by Archeops

Alain Benoit 1 P. Ade 2 A. Amblard 3 R. Ansari 4 E. Aubourg 5 S. Bargot 4 J. G. Bartlett 3 J. -Ph. Bernard 6 R. S. Bhatia 7 A. Blanchard 8 J. J. Bock 7, 9 A. Boscaleri 10 F. R. Bouchet 11 A. Bourrachot 4 P. Camus 1 F. Couchot 4 P. de Bernardis 12 J. Delabrouille 3 F. -X. Desert 13 O. Dore 11 M. Douspis 8 L. Dumoulin 14 X. Dupac 15 P. Filliatre 16 P. Fosalba 11 K. Ganga 17 F. Gannaway 2 B. Gautier 1 M. Giard 15 y. Giraud-Heraud 3 R. Gispert 18 L. Guglielmi 3 J. -Ch. Hamilton 3 S. Hanany 19 S. Henrot-Versille 4 J. Kaplan 3 Guilaine Lagache 20 J. -M. Lamarre 20 A. E. Lange 7 J.F. Macias-Perez 16 K. Madet 1 B. Maffei 2 Ch. Magneville 5 D. P. Marrone 19 S. Masi 12 F. Mayet 5 A. Murphy 21 F. Naraghi 16 F. Nati 12 G. Patanchon 3 G. Perrin 16 M. Piat 20 N. Ponthieu 16 S. Prunet 22 J. -L. Puget 20 C. Renault 16 C. Rosset 3 D. Santos 16 A. Starobinsky 23 I. Strukov 24 R. V. Sudiwala 2 R. Teyssier 20 M. Tristram 16 C. Tucker 2 J. -C. Vanel 3 D. Vibert 20 E. Wakui 2 D. yvon 5 
Abstract : We present a determination by the Archeops experiment of the angular power spectrum of the cosmic microwave background anisotropy in 16 bins over the multipole range $\ell$=15-350. Archeops was conceived as a precursor of the Planck HFI instrument by using the same optical design and the same technology for the detectors and their cooling. Archeops is a balloon-borne instrument consisting of a 1.5 m aperture diameter telescope and an array of 21 photometers maintained at ~100 mK that are operating in 4 frequency bands centered at 143, 217, 353 and 545 GHz. The data were taken during the Arctic night of February 7, 2002 after the instrument was launched by CNES from Esrange base (Sweden). The entire data cover ~ 30% of the sky.This first analysis was obtained with a small subset of the dataset using the most sensitive photometer in each CMB band (143 and 217 GHz) and 12.6% of the sky at galactic latitudes above 30 degrees where the foreground contamination is measured to be negligible. The large sky coverage and medium resolution (better than 15 arcminutes) provide for the first time a high signal-to-noise ratio determination of the power spectrum over angular scales that include both the first acoustic peak and scales probed by COBE/DMR. With a binning of $\Delta \ell$=7 to 25 the error bars are dominated by sample variance for $\ell$ below 200. A companion paper details the cosmological implications.
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Alain Benoit, P. Ade, A. Amblard, R. Ansari, E. Aubourg, et al.. The cosmic microwave background anisotropy power spectrum measured by Archeops. Astronomy and Astrophysics - A&A, EDP Sciences, 2003, 399, pp.L19-L23. ⟨10.1051/0004-6361:20021850⟩. ⟨hal-00009160⟩



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