The cosmic microwave background anisotropy power spectrum measured by Archeops

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 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 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 arcmin) 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 ℓΔ = 7 to 25 the error bars are dominated by sample variance for ℓ below 200. A companion paper details the cosmological implications.

Affiliated Institutions

• Institut des Sciences des Plantes de Paris Saclay FR
• Université Paris Cité FR
• Centre National d'Études Spatiales FR
• Conditions Extrêmes et Matériaux Haute Température et Irradiation FR
• Observatoire Midi-Pyrénées FR
• Jet Propulsion Laboratory US
• Space Research Institute RU
• National University of Ireland, Maynooth IE
• California Institute of Technology US
• Infrared Processing and Analysis Center US
• Collège de France FR
• CEA Paris-Saclay FR
• Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur FR
• Direction des énergies FR
• University of Minnesota US
• Laboratoire d’Etudes du Rayonnement et de la Matière en Astrophysique et Atmosphères FR
• Landau Institute for Theoretical Physics RU
• CEA Grenoble FR
• Institut d'Astrophysique Spatiale FR
• Institut d'Astrophysique de Paris FR
• Observatoire de Paris FR
• Cardiff University GB
• Université Paris-Saclay FR
• Agence Parisienne du Climat FR
• Commissariat à l'Énergie Atomique et aux Énergies Alternatives FR

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