Cosmological constraints from Archeops
Abstract
We analyze the cosmological constraints that Archeops 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, Omega(b)h^2 = 0.022 (+0.003,-0.004), compatible with Big-Bang nucleosynthesis and with a similar accuracy. Using cosmological priors obtainedfrom recent non-CMB data leads to yet tighter constraints on the total density, e.g. Omega(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, tau, is allowed to vary as a free parameter, and 0.96 (+0.03,-0.04) when tau is fixed to zero, both in good agreement with inflation.
Keywords
Cite
@article{arxiv.astro-ph/0210306,
title = {Cosmological constraints from Archeops},
author = {A. Benoit and P. Ade and A. Amblard and R. Ansari and E. Aubourg and S. Bargot and J. G. Bartlett and J. -Ph. Bernard and R. S. Bhatia and A. Blanchard and J. J. Bock and A. Boscaleri and F. R. Bouchet and A. Bourrachot and P. Camus and F. Couchot and P. de Bernardis and J. Delabrouille and F. -X. Desert and O. Doré and M. Douspis and L. Dumoulin and X. Dupac and P. Filliatre and P. Fosalba and K. Ganga and F. Gannaway and B. Gautier and M. Giard and Y. Giraud-Heraud and R. Gispert and L. Guglielmi and J. -Ch. Hamilton and S. Hanany and S. Henrot-Versille and J. Kaplan and G. Lagache and J. -M. Lamarre and A. E. Lange and J. F. Macias-Perez and K. Madet and B. Maffei and Ch. Magneville and D. P. Marrone and S. Masi and F. Mayet and A. Murphy and F. Naraghi and F. Nati and G. Patanchon and G. Perrin and M. Piat and N. Ponthieu and S. Prunet and J. -L. Puget and C. Renault and C. Rosset and D. Santos and A. Starobinsky and I. Strukov and R. V. Sudiwala and R. Teyssier and M. Tristram and C. Tucker and J. -C. Vanel and D. Vibert and E. Wakui and D. Yvon},
journal= {arXiv preprint arXiv:astro-ph/0210306},
year = {2009}
}
Comments
A&A Letter, in press, 6 pages, 7 figures, see also http://www.archeops.org