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Published February 14, 2003 | Published + Submitted
Journal Article Open

Cosmological constraints from Archeops


We analyze the cosmological constraints that Archeops (Benoît et al. 2003) places on adiabatic cold dark matter models with passive power-law initial fluctuations. Because its angular power spectrum has small bins in ℓ and large ℓ coverage down to COBE scales, Archeops provides a precise determination of the first acoustic peak in terms of position at multipole l_(peak) = 220 ± 6, height and width. An analysis of Archeops data in combination with other CMB datasets constrains the baryon content of the Universe, Ω_bh^2 = 0.022^(+0.003)_(-0.004), compatible with Big-Bang nucleosynthesis and with a similar accuracy. Using cosmological priors obtained from recent non-CMB data leads to yet tighter constraints on the total density, e.g. Ω_(tot) = 1.00^(+0.03)_(-0.02) using the HST determination of the Hubble constant. An excellent absolute calibration consistency is found between Archeops and other CMB experiments, as well as with the previously quoted best fit model. The spectral index n is measured to be 1.04^(+0.10)_(-0.12) when the optical depth to reionization, τ, is allowed to vary as a free parameter, and 0.96^(+0.03)_(-0.04) when τ is fixed to zero, both in good agreement with inflation.

Additional Information

© 2003 ESO. Received: 16 October 2002. Accepted: 22 November 2002. The authors would like to thank the following institutes for funding and balloon launching capabilities: CNES (French space agency), PNC (French Cosmology Program), ASI (Italian Space Agency), PPARC, NASA, the University of Minnesota, the American Astronomical Society and a CMBNet Research Fellowship from the European Commission.

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Published - aaej162.pdf

Submitted - 0210306.pdf


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August 19, 2023
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