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Astronomy and Astrophysics 399 (2003) L25-L30
Cosmological constraints from 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. Gautier, M. Giard, Y. Giraud-Heraud2, R. Gispert, L. Guglielmi2, J. -Ch. Hamilton2, S. Hanany, S. Henrot-Versille3, J. Kaplan2, 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. Vanel2, D. Vibert, E. Wakui, D. Yvon
For the ARCHEOPS collaboration(s)

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.
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
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics

Sciences of the Universe/Astrophysics
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