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Astronomy and Astrophysics 399 (2003) L19-L23
The Cosmic Microwave Background Anisotropy Power Spectrum measured by Archeops
Alain Benoit1, P. Ade, A. Amblard2, R. Ansari3, E. Aubourg4, S. Bargot3, J. G. Bartlett2, J. -Ph. Bernard5, R. S. Bhatia, A. Blanchard6, J. J. Bock, A. Boscaleri, F. R. Bouchet7, A. Bourrachot3, P. Camus1, F. Couchot3, P. De Bernardis, J. Delabrouille2, F. -X. Desert8, O. Dore7, M. Douspis6, L. Dumoulin9, X. Dupac10, P. Filliatre11, P. Fosalba7, K. Ganga, F. Gannaway, B. Gautier1, M. Giard10, Y. Giraud-Heraud2, R. Gispert12, L. Guglielmi2, J. -Ch. Hamilton2, S. Hanany, S. Henrot-Versille, J. Kaplan, G. Lagache, J. -M. Lamarre, A. E. Lange, J.F. Macias-Perez11, K. Madet, B. Maffei, Ch. Magneville, D. P. Marrone, S. Masi, F. Mayet, A. Murphy, F. Naraghi11, F. Nati, G. Patanchon, G. Perrin11, M. Piat, N. Ponthieu11, S. Prunet, J. -L. Puget, C. Renault11, C. Rosset, D. Santos11, A. Starobinsky, I. Strukov, R. V. Sudiwala, R. Teyssier, M. Tristram11, C. Tucker, J. -C. Vanel, D. Vibert, E. Wakui, D. Yvon

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 l=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(l)=7 to 25 the error bars are dominated by sample variance for l below 200. A companion paper details the cosmological implications.
1:  CRTBT - Centre de Recherches sur les Très Basses Températures
2:  PCC - Physique Corpusculaire et Cosmologie - Collège de France
3:  LAL - Laboratoire de l'Accélérateur Linéaire
4:  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
5:  IAS - Institut d'astrophysique spatiale
6:  LATT - Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées
7:  IAP - Institut d'Astrophysique de Paris
8:  LAOG - Laboratoire d'Astrophysique de Grenoble
9:  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
10:  CESR - Centre d'étude spatiale des rayonnements
11:  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
12:  LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics

Sciences of the Universe/Astrophysics
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