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Title:
Estimates of Cosmological Parameters Using the Cosmic Microwave Background Angular Power Spectrum of ACBAR
Authors:
Goldstein, J. H.; Ade, P. A. R.; Bock, J. J.; Bond, J. R.; Cantalupo, C.; Contaldi, C. R.; Daub, M. D.; Holzapfel, W. L.; Kuo, C.; Lange, A. E.; Lueker, M.; Newcomb, M.; Peterson, J. B.; Pogosyan, D.; Ruhl, J. E.; Runyan, M. C.; Torbet, E.
Affiliation:
AA(Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-7079.; Department of Physics, Broida Hall, Building 572, University of California, Santa Barbara, CA 93106-9530.), AB(School of Physics and Astronomy, University of Wales, Cardiff, 5 The Parade, Cardiff CF24 3YB, Wales, UK.), AC(Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109.), AD(Canadian Institute for Theoretical Astrophysics, McLennan Labs, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada.), AE(Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720.), AF(Canadian Institute for Theoretical Astrophysics, McLennan Labs, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada.), AG(University of California, 426 LeConte Hall, Berkeley, CA 94720-7300.), AH(University of California, 426 LeConte Hall, Berkeley, CA 94720-7300.), AI(University of California, 426 LeConte Hall, Berkeley, CA 94720-7300.), AJ(California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AK(University of California, 426 LeConte Hall, Berkeley, CA 94720-7300.), AL(University of California, 426 LeConte Hall, Berkeley, CA 94720-7300.), AM(Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213.), AN(Department of Physics, University of Alberta, Edmonton, AB T6G 2J1, Canada.), AO(Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106-7079.), AP(California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.), AQ(Department of Physics, Broida Hall, Building 572, University of California, Santa Barbara, CA 93106-9530.)
Publication:
The Astrophysical Journal, Volume 599, Issue 2, pp. 773-785. (ApJ Homepage)
Publication Date:
12/2003
Origin:
UCP
ApJ Keywords:
Cosmology: Cosmic Microwave Background, Cosmology: Cosmological Parameters, Cosmology: Observations
DOI:
10.1086/379539
Bibliographic Code:
2003ApJ...599..773G

Abstract

We report an investigation of cosmological parameters based on the measurements of anisotropy in the cosmic microwave background radiation (CMB) made by the Arcminute Cosmology Bolometer Array Receiver (ACBAR). We use the ACBAR data in concert with other recent CMB measurements to derive Bayesian estimates of parameters in inflation-motivated adiabatic cold dark matter models. We apply a series of additional cosmological constraints on the shape and amplitude of the density power spectrum and the Hubble parameter and from supernovae to further refine our parameter estimates. Previous estimates of parameters are confirmed, with sensitive measurements of the power spectrum now ranging from l~3 to 2800. Comparing individual best-fit models, we find that the addition of ΩΛ as a parameter dramatically improves the fits. We also use the high-l data of ACBAR, along with similar data from the Cosmic Background Imager and Berkeley-Illinois-Maryland Association array, to investigate potential secondary anisotropies from the Sunyaev-Zel'dovich effect. We show that the results from the three experiments are consistent under this interpretation and use the data, combined and individually, to estimate σ8 from the Sunyaev-Zel'dovich component.
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